The ancient Colosseum is seen after the lights were switched off for Earth Hour in Rome, Italy March 24, 2018. REUTERS/Stefano Rellandini TPX IMAGES OF THE DAY 

A combination picture shows a view of the ancient Colosseum before and after the lights were switched off for Earth Hour in Rome, Italy, March 24, 2018. REUTERS/Stefano Rellandini 

The ancient Colosseum is seen before the lights are switched off for Earth Hour in Rome, Italy March 24, 2018. REUTERS/Stefano Rellandini 

The ancient Colosseum is seen after the lights were switched off for Earth Hour in Rome, Italy March 24, 2018. REUTERS/Stefano Rellandini 

The Colosseum is seen during a heavy snowfall in Rome, Italy February 26, 2018. Picture taken with a fisheye lens. REUTERS/Alberto Lingria 

The Colosseum is seen during a heavy snowfall in Rome, Italy February 26, 2018. Picture taken with a fisheye lens. REUTERS/Alberto Lingria 

The ancient Colosseum is seen during a heavy snowfall early in the morning in Rome, Italy February 26, 2018. REUTERS/Remo Casilli 

Horse-drawn carriages are seen in front of Rome's ancient Colosseum downtown Rome, Italy, March 17, 2016. REUTERS/Stefano Rellandini 

People stand in queue at the entrance of Rome's ancient Colosseum downtown Rome, Italy, March 17, 2016. REUTERS/Stefano Rellandini 

A horse-drawn carriage is seen in front of Rome's ancient Colosseum downtown Rome, Italy, March 17, 2016. REUTERS/Stefano Rellandini 

People sit in a bar as a fan disperse mist in front of Colosseum during a hot summer day in in Rome, Italy August 8, 2015. REUTERS/Tony Gentile 

A worker is seen on a boom lift as he prepares for the restoration of Rome's ancient Colosseum, July 30, 2012. The ancient Colosseum of Rome, where gladiators fought for their lives, is slanting about 40 cm (16 inches) lower on the south side than on the north, and authorities are investigating whether it needs urgent repairs.
REUTERS/Alessandro Bianchi (ITALY - Tags: SOCIETY TRAVEL) 

People march past the Colosseum during the Europride gay parade in downtown Rome June 11, 2011. REUTERS/Alessia Pierdomenico (ITALY - Tags: SOCIETY) 

People take part in the annual gay pride parade in downtown Rome June 11, 2011. U.S. singer Lady Gaga is expected to perform at the end of parade. REUTERS/Alessia Pierdomenico (ITALY - Tags: SOCIETY) 

An aerial view of the Colosseum in Rome in this August 12, 2004 file photo. A prediction that a huge earthquake would destroy Rome on May 11, 2011 prompted fear in some and giggles of ridicule in others as officials reassured the populace that the eternal city would not be rubble by midnight. Picture taken August 12, 2004.
REUTERS/Alessandro Bianchi/Files (ITALY - Tags: DISASTER ENVIRONMENT SOCIETY) 

A chocolate sculpture of the Colosseum, created by Italian chocolatier Mirco Della Vecchia, is displayed as part of his "Chocolate World Heritage" exhibition in Hong Kong January 20, 2011. Vecchia currently holds the Guinness World Record title for making the largest chocolate sculpture in the world. REUTERS/Bobby Yip (CHINA - Tags: SOCIETY FOOD) 

A view from the grounds of Rome's ancient Colosseum October 14, 2010. Previously, the third tier terrace and dungeons of the 80 A.D. Roman amphitheatre have never been opened for public viewing. But recent restoration work, coupled with the need for more space at the Colosseum, have led Italy's heritage ministry to grant permission for larger areas to be made available for public access. REUTERS/Alessandro Bianchi (ITALY - Tags: SOCIETY TRAVEL) 

People visit the third tier of Rome's ancient Colosseum October 14, 2010. Besides the third tier terrace, dungeons of the 80 A.D. Roman amphitheatre, which would have housed animals and gladiators before fights, have never been opened for public viewing. But recent restoration work, coupled with the need for more space at the Colosseum, have led Italy's heritage ministry to grant permission for larger areas to be made available for public access. REUTERS/Alessandro Bianchi (ITALY - Tags: SOCIETY TRAVEL) 

A view of Rome's ancient Colosseum is seen August 5, 2010. Rome's ancient Colosseum literally crumbles from neglect, the cash-strapped Italian government is looking for private sponsors willing to help pay for restoration work in exchange for advertising rights.Picture taken August 5. REUTERS/Tony Gentile (ITALY - Tags: SOCIETY IMAGES OF THE DAY) 

A view of Rome's ancient Colosseum is seen August 5, 2010. Rome's ancient Colosseum literally crumbles from neglect, the cash-strapped Italian government is looking for private sponsors willing to help pay for restoration work in exchange for advertising rights. Picture taken August 5. REUTERS/Tony Gentile (ITALY - Tags: SOCIETY) 

Carabinieris stand guard in front of archaeological pieces displayed during a news conference inside the Colosseum in Rome July 16, 2010. Around 337 pieces, worth 15 million euros ($19.5 million) in archaeological value, were seized in Switzerland as part of an operation aimed at combating the illegal trafficking of archaeological materials, according to local media. The operation named "Andromeda" began two years ago. REUTERS/Remo Casilli (ITALY - Tags: CRIME LAW SOCIETY IMAGES OF THE DAY) 

Archaeological pieces are displayed during a news conference inside the Colosseum in Rome July 16, 2010. Around 337 pieces, worth 15 million euros ($19.5 million) in archaeological value, were seized in Switzerland as part of an operation aimed at combating the illegal trafficking of archaeological materials, according to local media. The operation named "Andromeda" began two years ago. REUTERS/Remo Casilli (ITALY - Tags: CRIME LAW SOCIETY) 

Rome's ancient Colosseum is seen from a helicopter October 26, 2004. Falling chunks of mortar from Rome's Colosseum has rekindled the debate about the state of the Italian capital's archaeological treasures -- some of which are literally falling apart. Three pieces of mortar -- measuring half a square metre -- collapsed at the weekend in the ancient amphitheatre, one of the most popular sites in Rome, plunging through a protective netting. Picture taken October 26, 2004. To match Reuters Life! ITALY-COLOSSEUM/ REUTERS/Alessandro Bianchi (ITALY - Tags: CITYSCAPE SOCIETY) 

Rome's ancient Colosseum is seen from a helicopter August 12, 2004. Falling chunks of mortar from Rome's Colosseum has rekindled the debate about the state of the Italian capital's archaeological treasures -- some of which are literally falling apart. Three pieces of mortar -- measuring half a square metre -- collapsed at the weekend in the ancient amphitheatre, one of the most popular sites in Rome, plunging through a protective netting. Picture taken August 12, 2004. To match Reuters Life! ITALY-COLOSSEUM/ REUTERS/Alessandro Bianchi (ITALY - Tags: SOCIETY CITYSCAPE) 

Rome's ancient Colosseum is seen from an elicopter August 12, 2004. Falling chunks of mortar from Rome's Colosseum has rekindled the debate about the state of the Italian capital's archaeological treasures -- some of which are literally falling apart. Three pieces of mortar -- measuring half a square metre -- collapsed at the weekend in the ancient amphitheatre, one of the most popular sites in Rome, plunging through a protective netting. Picture taken August 12, 2004. To match Reuters Life! ITALY-COLOSSEUM/ REUTERS/Alessandro Bianchi (ITALY - Tags: CITYSCAPE SOCIETY) 

A worker lights up the cross at the Colosseum in Rome April 2, 2010. Pope BenedictXVI will lead the traditional Via Crucis (Way of the Cross) at the Colosseum this evening. REUTERS/Max Rossi (ITALY - Tags: RELIGION) 

A policeman and his dog are silhouetted as they patrol near a cross at the Colosseum in Rome April 2, 2010. Pope Benedict XVI will lead the traditional Via Crucis (Way of the Cross) procession at the Colosseum on Friday evening to commemorate Christ's crucifixion and death. REUTERS/Max Rossi (ITALY - Tags: RELIGION SOCIETY ANNIVERSARY CRIME LAW IMAGES OF THE DAY) 

A man visits the Coliseum of Rome, Italy, August 16, 2009.REUTERS/Hazir Reka (ITALY)
TRAVEL) 

A group of young people pose in front of the Coliseum of Rome, Italy, August 16, 2009. REUTERS/Hazir Reka (ITALY TRAVEL) 

Astana rider Lance Armstrong of the U.S. crosses the finish line past the Colosseum at the end of the last stage of the Giro d'Italia in Rome, May 31, 2009. REUTERS/Stefano Rellandini (ITALY SPORT CYCLING IMAGES OF THE DAY) 

A man dressed as an ancient gladiator eats buffalo mozzarella cheese in front of the Colosseum in Rome April 2, 2008. Italian buffalo mozzarella cheese producers organized a demonstration to prove the quality of their cheese. REUTERS/Tony Gentile (ITALY) 

Rome's ancient Colosseum is lit up to celebrate the liberation of Italian journalist Giuliana Sgrena March 4, 2005. Italian journalist Giuliana Sgrena has been released in Iraq, a month after she was seized at gunpoint on a Baghdad street, Italy's foreign ministry said on Friday. . REUTERS/Benvegnu' Guaitoli 

Thousands of people take part in a candle-lit procession in front of Colosseum in Rome to honour the victims of the Beslan tragedy in Russia September 6, 2004. REUTERS/Alessandro Bianchi AB/GB/TW 

Torchbearer Emanuella Pierantozzi carries the Olympic Flame outside the ruins of the Coliseum during day 24 of the ATHENS 2004 Olympic Torch Relay on June 28, 2004 in Rome, Italy. The Olympic Flame travels to 34 cities in 27 countries en route to the Athens 2004 Olympic Games. REUTERS/Todd Warshaw/POOL jw/ca/SV 

Torchbearer Emanuela Pierantozzi carries the Olympic Flame outside the ruins of the Coliseum during the torch relay, June 28, 2004 in Rome. The Olympic Flame travels to 34 cities in 27 countries en route to the 2004 summer Olympics in Athens, Greece. REUTERS/Todd Warshaw/POOL JW/CA/GN 

Rome's world famous Colosseum is lit-up during the last hours of evening to celebrate the cancellation of 117 death sentences in Iran and the U.S. September 5, 2003. The lighting of the Colosseum will be repeated tomorrow evening to call attention to the imprisonment of Burma's Nobel Peace laureate Aung San Suu Kyi and the abduction of Colombian senator Ingrid Betancourt. BLIFE REUTERS/Max Rossi MR/WS 

Rome's worldfamous Colosseum is lit-up during the last hours of evening to
celebrate the cancellation of 117 death sentences in Iran and the U.S.
September 5, 2003. The lighting of the Colosseum will be repeated tomorrow
evening to call attention to the imprisonment of Burma's Nobel Peace
laureate Aung San Suu Kyi and the abduction of Colombian senator Ingrid
Betancourt. REUTERS/Max Rossi

MR/WS 

Tourists walk past the Colosseum in Rome August 12, 2003.
REUTERS/Tony Gentile

TG/SN 

Tourists walk past the Colosseum in Rome August 12, 2003.
REUTERS/Tony Gentile

TG/SN 

Anti-war protesters march in front of Rome's ancient Colosseum during a
demonstration against war on Iraq, February 15, 2003. To the sounds of
marching bands and under a sea of rainbow peace banners, an estimated one
million people marched through the streets of ancient Rome on Saturday to
oppose the threat of war on Iraq. REUTERS/Alessia Pierdomenico
Pictures of the month February 2003

AMP/jm 

People walk in front of Rome's ancient Colosseum lit with bright, gold
lights October 1, 2002. Rome's Colosseum, once the site of bloody
battles between gladiators and wild beasts, will be bathed in golden
light on Tuesday night to celebrate the Philippine's decision to
suspend death row executions. The Philippine's government announced on
Monday that it had suspended all executions while Congress debates a
proposed law abolishing the death penalty. REUTERS/Paolo
Cocco

PC/cmc 

An overview of Rome's ancient Colliseum lit up to celebrate the abolition of the death penalty in Chile June 19, 2001. Chile's Justice Minister Jose Antonio Gomez and Rome's mayor Walter Veltroni took part in ceremony at the Colliseum against the death penalty.

CRB/CRB 

A worker touches up part of a replica of Rome's ancient Coliseum, constructed from around 10 million used aluminium cans, in Rome January 12, 2001. Volunteers from blood and organ donation groups, who built the replica, hope to make it into the Guinness Book of Records. The structure will be torn down in February and the aluminium auctioned off with the proceeds going to raise money for ad campaigns on blood and organ donations.

AP 

A visitor looks at a replica of Rome's ancient Coliseum constructed from around 10 million used aluminium cans in Rome January 12, 2001. Volunteers from blood and organ donation groups, who built the replica, hope to make it into the Guinness Book of Records. The structure will be torn down in February and the aluminium auctioned off with the proceeds going to raise money for ad campaigns on blood and organ donations.

AP/JDP 

Italians navy militaries march in Fori Imperiali street in front of Rome's ancient Coliseum during the Day of Republic celebrations in Rome June 4. To celebrate the 54th anniversary of Italy's birth as a republic, the Italian armed forces marched for hours on the same road where Allied forces paraded in triumph after liberating Rome from Nazi occupation in 1944.

VP/FMS 

Italian rightists wave their party flags as they pass Rome's Coliseum, October 24. Italian rightists converged in the Piazza San Giovanni to protest against the newly formed centre-left government which they say grew out of the same communist soil as the notorious Red Brigade guerrilla movement of the 1970s.

VP/FMS 

Thousands of competitors run past the Coliseum during the Rome marathon March 29. The race, which passed through St Peter's square for the first time ever, was won by Italy's Stefano Baldini in two hours nine minutes and 33 seconds.

SPORT MARATHON 

Participants in the Rome marathon pass in front of the Colliseum at the start of the race March 24. Ethiopia's Moges Taye won the race in 2:12:02.

SPORT MARATHON