Messages are seen on facsimile presents under a Christmas tree as retired people demonstrate during a protest to defend pensions and purchasing power in Paris, France, December 18, 2018. REUTERS/Benoit Tessier

A protester wearing a yellow vest moves a burning facsimile voter registration card during a demonstration by the "yellow vests" movement in Nantes, France, December 15, 2018. REUTERS/Stephane Mahe

Protesters wearing yellow vests stand near a burning facsimile voter registration card during a demonstration by the "yellow vests" movement in Nantes, France, December 15, 2018. REUTERS/Stephane Mahe

A facsimile metro sign is seen between elevators at the entrance of France's Facebook headquarters in Paris, France, May 15, 2018. REUTERS/Charles Platiau

A facsimile metro sign is seen between elevators at the entrance of France's Facebook headquarters in Paris, France, May 15, 2018. REUTERS/Charles Platiau

Workers a facsimile of the U.S. constitution, part of the set for the second 2016 U.S. presidential debate, at Washington University in St. Louis, Missouri October 7, 2016. REUTERS/Rick Wilking

Catalan President Carles Puigdemont (L) browses through a facsimile of the second of part of Spanish writer Miguel de Cervantes' famous novel "Don Quijote" (Don Quixote) given to him by Spanish acting Prime Minister Mariano Rajoy (R) at the Moncloa Palace in Madrid, Spain, April 20, 2016. REUTERS/Susana Vera

Spanish acting Prime Minister Mariano Rajoy (R) gives Catalan President Carles Puigdemont a facsimile of the second of part of Spanish writer Miguel de Cervantes' famous novel "Don Quijote" (Don Quixote) at the Moncloa Palace in Madrid, Spain, April 20, 2016. REUTERS/Susana Ver

UEFA President Michel Platini (C), UEFA EURO 2016 president Jacques Lambert (2ndL) and former French soccer player Basile Boli pose with facsimiles of Euro 2016 tickets during a news conference a year before the start of Euro 2016, in Paris, France, June 10 2015. REUTERS/Charles Platiau

UEFA President Michel Platini (R) presents a facsimile of an Euro 2016 ticket to former soccer player Basile Boli (L) during a news conference a year before the start of Euro 2016, in Paris, France, June 10, 2015. REUTERS/Charles Platiau

UEFA President Michel Platini (C) and UEFA EURO 2016 president Jacques Lambert (R) present a facsimile of an Euro 2016 ticket to French President Francois Hollande (L) at the Elysee Palace in Paris, France, June 10, 2015, a year before the start of Euro 2016. REUTERS/Yoan Valat/Pool

UEFA President Michel Platini (L) and UEFA EURO 2016 president Jacques Lambert (R) present a facsimile of an Euro 2016 ticket to French President Francois Hollande (C) at the Elysee Palace in Paris, France, June 10, 2015, a year before the start of Euro 2016. REUTERS/Yoan Valat/Pool

UEFA President Michel Platini (C) and UEFA EURO 2016 president Jacques Lambert (R) present a facsimile of an Euro 2016 ticket to French President Francois Hollande (L) at the Elysee Palace in Paris, France, June 10, 2015, a year before the start of Euro 2016. REUTERS/Yoan Valat/Pool

French Minister for Ecology, Sustainable Development and Energy Segolene Royal presents to U.S. Deputy Secretary of State Antony Blinken, a facsimile of a letter from General Lafayette to the French Foreign Ministry, prior to the gala dinner in the honor of the French navy frigate L'Hermione at Mount Vernon, Virginia, on June 9, 2015. A replica of the L'Hermione which brought General Lafayette to America to rally rebels fighting Britain in the U.S. war of independence, arrived in the United States again, 235 years after the original's crossing. REUTERS/Mladen Antonov/Pool

A labour council representative holds a facsimile 500 euros note with the portrait of Carlos Ghosn, Chairman and CEO of the Renault-Nissan Alliance, before the French carmaker Renault's shareholders general meeting in Paris, France, April 30, 2015. REUTERS/Benoit Tessier

A labour council representative holds a facsimile 500 euros note with the portrait of Carlos Ghosn, Chairman and CEO of the Renault-Nissan Alliance, before the French carmaker Renault's shareholders general meeting in Paris, France, April 30, 2015. REUTERS/Benoit Tessier

Jean-Marie Chauvet (L), Eliette Brunel (C), and Christian Hilaire (R), who discovered the Grotte Chauvet in 1994, pose during the inauguration visit of the Cavern of Pont-d'Arc project in Vallon Pont d'Arc April 10, 2015. The Cavern of Pont-d'Arc project is a replica of the pre-historic decorated Cave of Pont-d'Arc known as Grotte Chauvet, in Vallon Pont-d'Arc in the Ardeche region, containing the world's earliest known art which was recently named a UNESCO World Heritage site. The facsimile cavern, which condenses some 8000m2 of the original site into 3000m2, will display faithful reproductions of paintings and engravings and will open to the public on April 25. REUTERS/Philippe Wojazer

Eliette Brunel (R), Christian Hilaire (2ndL) and Jean-Marie Chauvet (L), who discovered the Grotte Chauvet in 1994, talk with French President Francois Hollande as they attend the inauguration visit of the Cavern of Pont-d'Arc project in Vallon Pont d'Arc April 10, 2015. The Cavern of Pont-d'Arc project is a replica of the pre-historic decorated Cave of Pont-d'Arc known as Grotte Chauvet, in Vallon Pont-d'Arc in the Ardeche region, containing the world's earliest known art which was recently named a UNESCO World Heritage site. The facsimile cavern, which condenses some 8000m2 of the original site into 3000m2, will display faithful reproductions of paintings and engravings and will open to the public on April 25. REUTERS/Philippe Wojazer

French President Francois Hollande looks at paintings during the inauguration visit of the Cavern of Pont-d'Arc project, April 10, 2015. The Cavern of Pont-d'Arc project is a replica of the pre-historic decorated Cave of Pont-d'Arc known as Grotte Chauvet, in Vallon Pont-d'Arc in the Ardeche region, containing the world's earliest known art which was recently named a UNESCO World Heritage site. The facsimile cavern, which condenses some 8000m2 of the original site into 3000m2, will display faithful reproductions of paintings and engravings and will open to the public on April 25. REUTERS/Philippe Wojazer

French President Francois Hollande (C) listens to explanations of Pascal Terrasse (L), President of the Cavern of Pont-d'Arc project, during its inauguration visit in Vallon Pont d'Arc April 10, 2015. The Cavern of Pont-d'Arc project is a replica of the pre-historic decorated Cave of Pont-d'Arc known as Grotte Chauvet, in Vallon Pont-d'Arc in the Ardeche region, containing the world's earliest known art which was recently named a UNESCO World Heritage site. The facsimile cavern, which condenses some 8000m2 of the original site into 3000m2, will display faithful reproductions of paintings and engravings and will open to the public on April 25. REUTERS/Philippe Wojazer

French President Francois Hollande looks at paintings during the inauguration visit of the Cavern of Pont-d'Arc project, April 10, 2015. The Cavern of Pont-d'Arc project is a replica of the pre-historic decorated Cave of Pont-d'Arc known as Grotte Chauvet, in Vallon Pont-d'Arc in the Ardeche region, containing the world's earliest known art which was recently named a UNESCO World Heritage site. The facsimile cavern, which condenses some 8000m2 of the original site into 3000m2, will display faithful reproductions of paintings and engravings and will open to the public on April 25. REUTERS/Philippe Wojazer

French President Francois Hollande looks at paintings during the inauguration visit of the Cavern of Pont-d'Arc project, April 10, 2015. The Cavern of Pont-d'Arc project is a replica of the pre-historic decorated Cave of Pont-d'Arc known as Grotte Chauvet, in Vallon Pont-d'Arc in the Ardeche region, containing the world's earliest known art which was recently named a UNESCO World Heritage site. The facsimile cavern, which condenses some 8000m2 of the original site into 3000m2, will display faithful reproductions of paintings and engravings and will open to the public on April 25. REUTERS/Philippe Wojazer

French President Francois Hollande (L) listens to explanations of Pascal Terrasse, President of the Cavern of Pont-d'Arc project, during its inauguration visit in Vallon Pont d'Arc April 10, 2015. The Cavern of Pont-d'Arc project is a replica of the pre-historic decorated Cave of Pont-d'Arc known as Grotte Chauvet, in Vallon Pont-d'Arc in the Ardeche region, containing the world's earliest known art which was recently named a UNESCO World Heritage site. The facsimile cavern, which condenses some 8000m2 of the original site into 3000m2, will display faithful reproductions of paintings and engravings and will open to the public on April 25. REUTERS/Philippe Wojazer

French President Francois Hollande (R) listens to explanations of Pascal Terrasse, President of the Cavern of Pont-d'Arc project, during its inauguration visit in Vallon Pont d'Arc April 10, 2015. The Cavern of Pont-d'Arc project is a replica of the pre-historic decorated Cave of Pont-d'Arc known as Grotte Chauvet, in Vallon Pont-d'Arc in the Ardeche region, containing the world's earliest known art which was recently named a UNESCO World Heritage site. The facsimile cavern, which condenses some 8000m2 of the original site into 3000m2, will display faithful reproductions of paintings and engravings and will open to the public on April 25. REUTERS/Philippe Wojazer

French President Francois Hollande (L) listens to explanations of Pascal Terrasse, President of the Cavern of Pont-d'Arc rroject, during its inauguration visit in Vallon Pont d'Arc April 10, 2015. The Cavern of Pont-d'Arc project is a replica of the pre-historic decorated Cave of Pont-d'Arc known as Grotte Chauvet, in Vallon Pont-d'Arc in the Ardeche region, containing the world's earliest known art which was recently named a UNESCO World Heritage site. The facsimile cavern, which condenses some 8000m2 of the original site into 3000m2, will display faithful reproductions of paintings and engravings and will open to the public on April 25. REUTERS/Philippe Wojazer

French President Francois Hollande (C) listens to explanations of Pascal Terrasse (L), President of the Cavern of Pont-d'Arc Grand Project, during its inauguration visit in Vallon Pont d'Arc April 10, 2015. The Cavern of Pont-d'Arc project is a replica of the pre-historic decorated Cave of Pont-d'Arc known as Grotte Chauvet, in Vallon Pont-d'Arc in the Ardeche region, containing the world's earliest known art which was recently named a UNESCO World Heritage site. The facsimile cavern, which condenses some 8000m2 of the original site into 3000m2, will display faithful reproductions of paintings and engravings and will open to the public on April 25. REUTERS/Philippe Wojazer

French President Francois Hollande looks at paintings during the inauguration visit of the Cavern of Pont-d'Arc project, April 10, 2015. The Cavern of Pont-d'Arc project is a replica of the pre-historic decorated Cave of Pont-d'Arc known as Grotte Chauvet, in Vallon Pont-d'Arc in the Ardeche region, containing the world's earliest known art which was recently named a UNESCO World Heritage site. The facsimile cavern, which condenses some 8000m2 of the original site into 3000m2, will display faithful reproductions of paintings and engravings and will open to the public on April 25. REUTERS/Philippe Wojazer TPX IMAGES OF THE DAY

French President Francois Hollande (R) listens to explanations of Pascal Terrasse, President of the Cavern of Pont-d'Arc Grand Project, during its inauguration visit in Vallon Pont d'Arc April 10, 2015. The Cavern of Pont-d'Arc project is a replica of the pre-historic decorated Cave of Pont-d'Arc known as Grotte Chauvet, in Vallon Pont-d'Arc in the Ardeche region, containing the world's earliest known art which was recently named a UNESCO World Heritage site. The facsimile cavern, which condenses some 8000m2 of the original site into 3000m2, will display faithful reproductions of paintings and engravings and will open to the public on April 25. REUTERS/Philippe Wojazer

A replica of pre-historic animals drawings is seen on a wall during a press visit at the site of the Cavern of Pont-d'Arc project in Vallon Pont d'Arc April 8, 2015. The Cavern of Pont-d'Arc project is a replica of the pre-historic Decorated Cave of Pont-d'Arc known as Grotte Chauvet, in Vallon Pont-d'Arc in the Ardeche region, containing the world's earliest known art which was recently named a UNESCO World Heritage site. The facsimile cavern, which condenses some 8000m2 of the original site into 3000m2, will display faithful reproductions of paintings and engravings and will be inaugurated on April 10 and will open to the public on April 25. REUTERS/Robert Pratta

A view shows the site of the Cavern of Pont-d'Arc project during a press visit in Vallon Pont d'Arc April 8, 2015. The Cavern of Pont-d'Arc project is a replica of the pre-historic Decorated Cave of Pont-d'Arc known as Grotte Chauvet, in Vallon Pont-d'Arc in the Ardeche region, containing the world's earliest known art which was recently named a UNESCO World Heritage site. The facsimile cavern, which condenses some 8000m2 of the original site into 3000m2, will display faithful reproductions of paintings and engravings and will be inaugurated on April 10 and will open to the public on April 25. REUTERS/Robert Pratta

A view shows the site of the Cavern of Pont-d'Arc project during a press visit in Vallon Pont d'Arc April 8, 2015. The Cavern of Pont-d'Arc project is a replica of the pre-historic Decorated Cave of Pont-d'Arc known as Grotte Chauvet, in Vallon Pont-d'Arc in the Ardeche region, containing the world's earliest known art which was recently named a UNESCO World Heritage site. The facsimile cavern, which condenses some 8000m2 of the original site into 3000m2, will display faithful reproductions of paintings and engravings and will be inaugurated on April 10 and will open to the public on April 25. REUTERS/Robert Pratta

A replica of pre-historic drawings showing lions is seen on a wall during a press visit at the site of the Cavern of Pont-d'Arc project in Vallon Pont d'Arc April 8, 2015. The Cavern of Pont-d'Arc project is a replica of the pre-historic Decorated Cave of Pont-d'Arc known as Grotte Chauvet, in Vallon Pont-d'Arc in the Ardeche region, containing the world's earliest known art which was recently named a UNESCO World Heritage site. The facsimile cavern, which condenses some 8000m2 of the original site into 3000m2, will display faithful reproductions of paintings and engravings and will be inaugurated on April 10 and will open to the public on April 25. REUTERS/Robert Pratta

Visitors look at a replica of pre-historic drawings on a wall during a press visit at the site of the Cavern of Pont-d'Arc project in Vallon Pont d'Arc April 8, 2015. The Cavern of Pont-d'Arc project is a replica of the pre-historic Decorated Cave of Pont-d'Arc known as Grotte Chauvet, in Vallon Pont-d'Arc in the Ardeche region, containing the world's earliest known art which was recently named a UNESCO World Heritage site. The facsimile cavern, which condenses some 8000m2 of the original site into 3000m2, will display faithful reproductions of paintings and engravings and will be inaugurated on April 10 and will open to the public on April 25. REUTERS/Robert Pratta

A view shows the site of the Cavern of Pont-d'Arc project during a press visit in Vallon Pont d'Arc April 8, 2015. The Cavern of Pont-d'Arc project is a replica of the pre-historic Decorated Cave of Pont-d'Arc known as Grotte Chauvet, in Vallon Pont-d'Arc in the Ardeche region, containing the world's earliest known art which was recently named a UNESCO World Heritage site. The facsimile cavern, which condenses some 8000m2 of the original site into 3000m2, will display faithful reproductions of paintings and engravings and will be inaugurated on April 10 and will open to the public on April 25. REUTERS/Robert Pratta

A replica of pre-historic drawings showing animals is seen on a wall during a press visit at the site of the Cavern of Pont-d'Arc project in Vallon Pont d'Arc April 8, 2015. The Cavern of Pont-d'Arc project is a replica of the pre-historic Decorated Cave of Pont-d'Arc known as Grotte Chauvet, in Vallon Pont-d'Arc in the Ardeche region, containing the world's earliest known art which was recently named a UNESCO World Heritage site. The facsimile cavern, which condenses some 8000m2 of the original site into 3000m2, will display faithful reproductions of paintings and engravings and will be inaugurated on April 10 and will open to the public on April 25. REUTERS/Robert Pratta

A replica of pre-historic drawings showing animals is seen on a wall during a press visit at the site of the Cavern of Pont-d'Arc project in Vallon Pont d'Arc April 8, 2015. The Cavern of Pont-d'Arc project is a replica of the pre-historic Decorated Cave of Pont-d'Arc known as Grotte Chauvet, in Vallon Pont-d'Arc in the Ardeche region, containing the world's earliest known art which was recently named a UNESCO World Heritage site. The facsimile cavern, which condenses some 8000m2 of the original site into 3000m2, will display faithful reproductions of paintings and engravings and will be inaugurated on April 10 and will open to the public on April 25. REUTERS/Robert Pratta

A view shows the site of the Cavern of Pont-d'Arc project during a press visit in Vallon Pont d'Arc April 8, 2015. The Cavern of Pont-d'Arc project is a replica of the pre-historic Decorated Cave of Pont-d'Arc known as Grotte Chauvet, in Vallon Pont-d'Arc in the Ardeche region, containing the world's earliest known art which was recently named a UNESCO World Heritage site. The facsimile cavern, which condenses some 8000m2 of the original site into 3000m2, will display faithful reproductions of paintings and engravings and will be inaugurated on April 10 and will open to the public on April 25. REUTERS/Robert Pratta

French prehistorian Jean Clottes speaks to journalists during a press visit of the Cavern of Pont-d'Arc project site in Vallon Pont d'Arc April 8, 2015. The Cavern of Pont-d'Arc project is a replica of the pre-historic Decorated Cave of Pont-d'Arc known as Grotte Chauvet, in Vallon Pont-d'Arc in the Ardeche region, containing the world's earliest known art which was recently named a UNESCO World Heritage site. The facsimile cavern, which condenses some 8000m2 of the original site into 3000m2, will display faithful reproductions of paintings and engravings and will be inaugurated on April 10 and will open to the public on April 25. REUTERS/Robert Pratta

A replica of pre-historic drawings showing lions is seen on a wall during a press visit at the site of the Cavern of Pont-d'Arc project in Vallon Pont d'Arc April 8, 2015. The Cavern of Pont-d'Arc project is a replica of the pre-historic Decorated Cave of Pont-d'Arc known as Grotte Chauvet, in Vallon Pont-d'Arc in the Ardeche region, containing the world's earliest known art which was recently named a UNESCO World Heritage site. The facsimile cavern, which condenses some 8000m2 of the original site into 3000m2, will display faithful reproductions of paintings and engravings and will be inaugurated on April 10 and will open to the public on April 25. REUTERS/Robert Pratta TPX IMAGES OF THE DAY

Visitors look at a replica of pre-historic engravings during a press visit of the Cavern of Pont-d'Arc project site in Vallon Pont d'Arc April 8, 2015. The Cavern of Pont-d'Arc project is a replica of the pre-historic Decorated Cave of Pont-d'Arc known as Grotte Chauvet, in Vallon Pont-d'Arc in the Ardeche region, containing the world's earliest known art which was recently named a UNESCO World Heritage site. The facsimile cavern, which condenses some 8000m2 of the original site into 3000m2, will display faithful reproductions of paintings and engravings and will be inaugurated on April 10 and open to the public on April 25 and will open to the public on April 25. REUTERS/Robert Pratta

A replica of a pre-historic animal drawing is seen on wall at the site of the Cavern of Pont-d'Arc project during a press visit in Vallon Pont d'Arc April 8, 2015. The Cavern of Pont-d'Arc project is a replica of the pre-historic Decorated Cave of Pont-d'Arc known as Grotte Chauvet, in Vallon Pont-d'Arc in the Ardeche region, containing the world's earliest known art which was recently named a UNESCO World Heritage site. The facsimile cavern, which condenses some 8000m2 of the original site into 3000m2, will display faithful reproductions of paintings and engravings and will be inaugurated on April 10 and will open to the public on April 25. REUTERS/Robert Pratta

A visitor looks at a replica of pre-historic animals drawings seen on a wall during a press visit of the Cavern of Pont-d'Arc project site in Vallon Pont d'Arc April 8, 2015. The Cavern of Pont-d'Arc project is a replica of the pre-historic Decorated Cave of Pont-d'Arc known as Grotte Chauvet, in Vallon Pont-d'Arc in the Ardeche region, containing the world's earliest known art which was recently named a UNESCO World Heritage site. The facsimile cavern, which condenses some 8000m2 of the original site into 3000m2, will display faithful reproductions of paintings and engravings and will be inaugurated on April 10 and open to the public on April 25 and will open to the public on April 25. REUTERS/Robert Pratta

A replica of pre-historic animals drawings is seen on a wall during a press visit at the site of the Cavern of Pont-d'Arc project in Vallon Pont d'Arc April 8, 2015. The Cavern of Pont-d'Arc project is a replica of the pre-historic Decorated Cave of Pont-d'Arc known as Grotte Chauvet, in Vallon Pont-d'Arc in the Ardeche region, containing the world's earliest known art which was recently named a UNESCO World Heritage site. The facsimile cavern, which condenses some 8000m2 of the original site into 3000m2, will display faithful reproductions of paintings and engravings and will be inaugurated on April 10 and will open to the public on April 25. REUTERS/Robert Pratta

A view shows the site of the Cavern of Pont-d'Arc project during a press visit in Vallon Pont d'Arc April 8, 2015. The Cavern of Pont-d'Arc project is a replica of the pre-historic Decorated Cave of Pont-d'Arc known as Grotte Chauvet, in Vallon Pont-d'Arc in the Ardeche region, containing the world's earliest known art which was recently named a UNESCO World Heritage site. The facsimile cavern, which condenses some 8000m2 of the original site into 3000m2, will display faithful reproductions of paintings and engravings and will be inaugurated on April 10 and will open to the public on April 25. REUTERS/Robert Pratta

A view shows the site of the Cavern of Pont-d'Arc project during a press visit in Vallon Pont d'Arc April 8, 2015. The Cavern of Pont-d'Arc project is a replica of the pre-historic Decorated Cave of Pont-d'Arc known as Grotte Chauvet, in Vallon Pont-d'Arc in the Ardeche region, containing the world's earliest known art which was recently named a UNESCO World Heritage site. The facsimile cavern, which condenses some 8000m2 of the original site into 3000m2, will display faithful reproductions of paintings and engravings and will be inaugurated on April 10 and will open to the public on April 25. REUTERS/Robert Pratta

A view shows the site of the Cavern of Pont-d'Arc project during a press visit in Vallon Pont d'Arc April 8, 2015. The Cavern of Pont-d'Arc project is a replica of the pre-historic Decorated Cave of Pont-d'Arc known as Grotte Chauvet, in Vallon Pont-d'Arc in the Ardeche region, containing the world's earliest known art which was recently named a UNESCO World Heritage site. The facsimile cavern, which condenses some 8000m2 of the original site into 3000m2, will display faithful reproductions of paintings and engravings and will be inaugurated on April 10 and will open to the public on April 25. REUTERS/Robert Pratta

A visitor looks at a replica of pre-historic animals drawings on a wall during a press visit at the site of the Cavern of Pont-d'Arc project in Vallon Pont d'Arc April 8, 2015. The Cavern of Pont-d'Arc project is a replica of the pre-historic Decorated Cave of Pont-d'Arc known as Grotte Chauvet, in Vallon Pont-d'Arc in the Ardeche region, containing the world's earliest known art which was recently named a UNESCO World Heritage site. The facsimile cavern, which condenses some 8000m2 of the original site into 3000m2, will display faithful reproductions of paintings and engravings and will be inaugurated on April 10 and will open to the public on April 25. REUTERS/Robert Pratta TPX IMAGES OF THE DAY

A replica of pre-historic drawings showing horses, rhinoceros and aurochs is seen on a wall during a press visit at the site of the Cavern of Pont-d'Arc project in Vallon Pont d'Arc April 8, 2015. The Cavern of Pont-d'Arc project is a replica of the pre-historic Decorated Cave of Pont-d'Arc known as Grotte Chauvet, in Vallon Pont-d'Arc in the Ardeche region, containing the world's earliest known art which was recently named a UNESCO World Heritage site. The facsimile cavern, which condenses some 8000m2 of the original site into 3000m2, will display faithful reproductions of paintings and engravings and will be inaugurated on April 10 and will open to the public on April 25. REUTERS/Robert Pratta

French prehistorian Jean Clottes speaks to journalists during a press visit of the Cavern of Pont-d'Arc project site in Vallon Pont d'Arc April 8, 2015. The Cavern of Pont-d'Arc project is a replica of the pre-historic Decorated Cave of Pont-d'Arc known as Grotte Chauvet, in Vallon Pont-d'Arc in the Ardeche region, containing the world's earliest known art which was recently named a UNESCO World Heritage site. The facsimile cavern, which condenses some 8000m2 of the original site into 3000m2, will display faithful reproductions of paintings and engravings and will be inaugurated on April 10 and will open to the public on April 25. REUTERS/Robert Pratta

A replica of pre-historic engravings showing a horse and an owl are seen on wall during a press visit at the site of the Cavern of Pont-d'Arc project in Vallon Pont d'Arc April 8, 2015. The Cavern of Pont-d'Arc project is a replica of the pre-historic Decorated Cave of Pont-d'Arc known as Grotte Chauvet, in Vallon Pont-d'Arc in the Ardeche region, containing the world's earliest known art which was recently named a UNESCO World Heritage site. The facsimile cavern, which condenses some 8000m2 of the original site into 3000m2, will display faithful reproductions of paintings and engravings and will be inaugurated on April 10 and will open to the public on April 25. REUTERS/Robert Pratta

A visitor takes pictures of a replica of pre-historic animals drawings seen on a wall during a press visit of the Cavern of Pont-d'Arc project site in Vallon Pont d'Arc April 8, 2015. The Cavern of Pont-d'Arc project is a replica of the pre-historic Decorated Cave of Pont-d'Arc known as Grotte Chauvet, in Vallon Pont-d'Arc in the Ardeche region, containing the world's earliest known art which was recently named a UNESCO World Heritage site. The facsimile cavern, which condenses some 8000m2 of the original site into 3000m2, will display faithful reproductions of paintings and engravings and will be inaugurated on April 10 and open to the public on April 25 and will open to the public on April 25. REUTERS/Robert Pratta

A view shows the Cavern of Pont-d'Arc project site during a press visit in Vallon Pont d'Arc April 8, 2015. The Cavern of Pont-d'Arc project is a replica of the pre-historic Decorated Cave of Pont-d'Arc known as Grotte Chauvet, in Vallon Pont-d'Arc in the Ardeche region, containing the world's earliest known art which was recently named a UNESCO World Heritage site. The facsimile cavern, which condenses some 8000m2 of the original site into 3000m2, will display faithful reproductions of paintings and engravings and will be inaugurated on April 10 and will open to the public on April 25. REUTERS/Robert Pratta

A French healthcare professional carries a facsimile Carte Vitale card with the message, "fatal to the private hospital", and bearing the portrait of French President Francois Hollande is seen on a tree during a protest against the government?s proposed health reforms in front of the National Assembly in Paris March 31, 2015. The National Assembly started a debate about a new public healthcare bill. REUTERS/Charles Platiau

A French healthcare professional carries a facsimile Carte Vitale card with the message, "fatal to the private hospital", and bearing the portrait of French President Francois Hollande is pictured during a protest against the government?s proposed health reforms in front of the National Assembly in Paris March 31, 2015. The National Assembly started a debate about a new public healthcare bill. REUTERS/Charles Platiau

A French healthcare professional carries a facsimile Carte Vitale card with the message, "Deadly for independant health care", and bearing the portrait of French Social Affairs, Health and Women Rights Minister Marisol Touraine at a national protest demonstration in Paris March 15, 2015. Thousands of healthcare professionals protest the new public healthcare bill by the French Health minister. REUTERS/Gonzalo Fuentes (FRANCE - Tags: HEALTH POLITICS TPX IMAGES OF THE DAY)

French doctors, medical students, hospital interns attend a national demonstration as they carry facsimile Carte Vitale cards with the message, "Deadly for independant health care", and bearing the portrait of French Social Affairs, Health and Women Rights Minister Marisol Touraine in Paris March 15, 2015. Thousands of healthcare professionals protest the new public healthcare bill by the French Health minister. REUTERS/Gonzalo Fuentes (FRANCE - Tags: HEALTH POLITICS)

A view shows the entrance of the Cavern of Pont-d'Arc project site in Vallon Pont d'Arc, June 26, 2014 . The Cavern of Pont-d'Arc project is a replica of the pre-historic Decorated Cave of Pont-d'Arc known as Grotte Chauvet, in Vallon Pont-d'Arc in the Ardeche region, containing the world's earliest known art which was recently named a UNESCO World Heritage site. The facsimile cavern, which condenses some 8000m2 of the original site into 3000m2, will display faithful reproductions of paintings and engravings and is planned to open to the public in Spring 2015. Picture taken June 26, 2014. REUTERS/Robert Pratta (FRANCE - Tags: SOCIETY)

A replica of a pre-historic drawing showing a bison is seen on a wall at the site of the Cavern of Pont-d'Arc project in Vallon Pont d'Arc, June 26, 2014. The Cavern of Pont-d'Arc project is a replica of the pre-historic Decorated Cave of Pont-d'Arc known as Grotte Chauvet, in Vallon Pont-d'Arc in the Ardeche region, containing the world's earliest known art which was recently named a UNESCO World Heritage site. The facsimile cavern, which condenses some 8000m2 of the original site into 3000m2, will display faithful reproductions of paintings and engravings and is planned to open to the public in Spring 2015. Picture taken 26, 2014. REUTERS/Robert Pratta (FRANCE - Tags: SOCIETY ANIMALS)

A general view shows the river Ardeche and the Gorges near the site of the Cavern of Pont-d'Arc project in Vallon Pont d'Arc, June 26, 2014. The Cavern of Pont-d'Arc project is a replica of the pre-historic Decorated Cave of Pont-d'Arc known as Grotte Chauvet, in Vallon Pont-d'Arc in the Ardeche region, containing the world's earliest known art which was recently named a UNESCO World Heritage site. The facsimile cavern, which condenses some 8000m2 of the original site into 3000m2, will display faithful reproductions of paintings and engravings and is planned to open to the public in Spring 2015. Picture taken June 26, 2014. REUTERS/Robert Pratta (FRANCE - Tags: SOCIETY TRAVEL)

A general view shows the river Ardeche and the Gorges near the site of the Cavern of Pont-d'Arc project in Vallon Pont d'Arc, June 26, 2014. The Cavern of Pont-d'Arc project is a replica of the pre-historic Decorated Cave of Pont-d'Arc known as Grotte Chauvet, in Vallon Pont-d'Arc in the Ardeche region, containing the world's earliest known art which was recently named a UNESCO World Heritage site. The facsimile cavern, which condenses some 8000m2 of the original site into 3000m2, will display faithful reproductions of paintings and engravings and is planned to open to the public in Spring 2015. Picture taken June 26, 2014. REUTERS/Robert Pratta (FRANCE - Tags: SOCIETY TRAVEL)