Miomir Korac, lead archaeologist, poses for a picture at the remains of Roman legion's headquarters at the ancient city of Viminacium, near Kostolac, Serbia, November 25, 2020. Picture taken November 25, 2020. REUTERS/Marko Djurica

An archaeologist excavates the remains of Roman legion's headquarters at the ancient city of Viminacium, near Kostolac, Serbia, November 25, 2020. Picture taken November 25, 2020. REUTERS/Marko Djurica

Silver coins found at the remains of a Roman legion's headquarters are seen at the ancient city of Viminacium, near Kostolac, Serbia, November 25, 2020. Picture taken November 25, 2020. REUTERS/Marko Djurica

Archaeologists excavate the remains of Roman legion's headquarters at the ancient city of Viminacium, near Kostolac, Serbia, November 25, 2020. Picture taken November 25, 2020. REUTERS/Marko Djurica

Archaeologists excavate the remains of Roman legion's headquarters at the ancient city of Viminacium, near Kostolac, Serbia, November 25, 2020. Picture taken November 25, 2020. REUTERS/Marko Djurica

Archaeologists excavate the remains of Roman legion's headquarters at the ancient city of Viminacium, near Kostolac, Serbia, November 25, 2020. Picture taken November 25, 2020. Picture taken with a drone. REUTERS/Marko Djurica

Archaeologists excavate the remains of Roman legion's headquarters at the ancient city of Viminacium, near Kostolac, Serbia, November 25, 2020. Picture taken November 25, 2020. Picture taken with a drone. REUTERS/Marko Djurica

Archaeologists excavate the remains of Roman legion's headquarters at the ancient city of Viminacium, near Kostolac, Serbia, November 25, 2020. Picture taken November 25, 2020. Picture taken with a drone. REUTERS/Marko Djurica

Archaeologists excavate the remains of Roman legion's headquarters at the ancient city of Viminacium, near Kostolac, Serbia, November 25, 2020. Picture taken November 25, 2020. Picture taken with a drone. REUTERS/Marko Djurica

Aram Mehdi, an Iraqi Kurd who recently converted from Islam to Zoroastriansim, visits an archeological site said to have been a place of worship for Zoroastrians, in Dohuk, Iraq September 8, 2020. Picture taken September 8, 2020. REUTERS/Charlotte Bruneau

Aram Mehdi, an Iraqi Kurd who recently converted from Islam to Zoroastriansim, holds his hat as he visits an archeological site said to have been a place of worship for Zoroastrians, in Dohuk, Iraq September 8, 2020. Picture taken September 8, 2020. REUTERS/Charlotte Bruneau

Iraqi Kurds Chia Belizani and Aram Mehdi, who converted from Islam to Zoriastriansim, visit an archeological site said to have been a place of worship for Zoroastrians, in Dohuk, Iraq September 8, 2020. Picture taken September 8, 2020. REUTERS/Charlotte Bruneau

Aram Mehdi, an Iraqi Kurd who recently converted from Islam to Zoroastriansim, is picture as he visits an archeological site said to have been a place of worship for Zoroastrians, in Dohuk, Iraq September 8, 2020. Picture taken September 8, 2020. REUTERS/Charlotte Bruneau

Helan Chia, head of the new 'Yasna' centre for the promotion of cultural aspects of Zoroastriansim, visits an archeological site said to have been a place of worship for Zoroastrians, in Dohuk, Iraq September 8, 2020. Picture taken September 8, 2020. REUTERS/Charlotte Bruneau

Iraqi Kurds Chia Belizani and Aram Mehdi, who converted from Islam to Zoriastriansim, visit an archeological site said to have been a place of worship for Zoroastrians, in Dohuk, Iraq September 8, 2020. Picture taken September 8, 2020. REUTERS/Charlotte Bruneau

A sniper is seen as U.S. Secretary of State Mike Pompeo with his wife Susan Pompeo (both not pictured) and Greek Prime Minister Kyriakos Mitsotakis with his wife Mareva Grabowski (both not pictured) visit the archeological site of Aptera, Crete, Greece September 29, 2020. Aris Messinis/Pool via REUTERS

U.S. Secretary of State Mike Pompeo with his wife Susan Pompeo and Greek Prime Minister Kyriakos Mitsotakis with his wife Mareva Grabowski (both not pictured) visit the archeological site of Aptera, Crete, Greece September 29, 2020. Aris Messinis/Pool via REUTERS

U.S. Secretary of State Mike Pompeo with his wife Susan Pompeo and Greek Prime Minister Kyriakos Mitsotakis with his wife Mareva Grabowski (not pictured) visit the archeological site of Aptera, Crete, Greece September 29, 2020. Aris Messinis/Pool via REUTERS

U.S. Secretary of State Mike Pompeo with his wife Susan Pompeo and Greek Prime Minister Kyriakos Mitsotakis with his wife Mareva Grabowski visit the archeological site of Aptera, Crete, Greece September 29, 2020. Aris Messinis/Pool via REUTERS

U.S. Secretary of State Mike Pompeo with his wife Susan Pompeo and Greek Prime Minister Kyriakos Mitsotakis with his wife Mareva Grabowski visit the archeological site of Aptera, Crete, Greece September 29, 2020. Aris Messinis/Pool via REUTERS

U.S. Secretary of State Mike Pompeo with his wife Susan Pompeo and Greek Prime Minister Kyriakos Mitsotakis with his wife Mareva Grabowski visit the archeological site of Aptera, Crete, Greece September 29, 2020. Aris Messinis/Pool via REUTERS

U.S. Secretary of State Mike Pompeo with his wife Susan Pompeo and Greek Prime Minister Kyriakos Mitsotakis with his wife Mareva Grabowski visit the archeological site of Aptera, Crete, Greece September 29, 2020. Aris Messinis/Pool via REUTERS

U.S. Secretary of State Mike Pompeo and Greek Prime Minister Kyriakos Mitsotakis visit the archeological site of Aptera, Crete, Greece September 29, 2020. Aris Messinis/Pool via REUTERS

U.S. Secretary of State Mike Pompeo and Greek Prime Minister Kyriakos Mitsotakis visit the archeological site of Aptera, Crete, Greece September 29, 2020. Aris Messinis/Pool via REUTERS

U.S. Secretary of State Mike Pompeo and Greek Prime Minister Kyriakos Mitsotakis visit the archeological site of Aptera, Crete, Greece September 29, 2020. Aris Messinis/Pool via REUTERS

U.S. Secretary of State Mike Pompeo and Greek Prime Minister Kyriakos Mitsotakis visit the archeological site of Aptera, Crete, Greece September 29, 2020. Aris Messinis/Pool via REUTERS

U.S. Secretary of State Mike Pompeo and Greek Prime Minister Kyriakos Mitsotakis visit the archeological site of Aptera, Crete, Greece September 29, 2020. Aris Messinis/Pool via REUTERS

Young Palestinian travel bloggers Malak Hasan and Bisan Alhajhasan sit at the remains of an archeological site in the village of Aboud near Ramallah in the Israeli-occupied West Bank September 15, 2020. Picture taken September 15, 2020. REUTERS/Ammar Awad

Young Palestinian travel bloggers Malak Hasan and Bisan Alhajhasan take a selfie at the remains of an archeological site in the village of Aboud near Ramallah in the Israeli-occupied West Bank September 15, 2020. Picture taken September 15, 2020. REUTERS/Ammar Awad

A view shows human remains found in an archeological dig, during the search for Irish nobleman Hugh O'Donnell in Valladolid, Spain May 29, 2020. REUTERS/Juan Medina

A man wearing a face mask works in an archeological dig, during the search for Irish nobleman Hugh O'Donnell in Valladolid, Spain May 29, 2020. REUTERS/Juan Medina

A man wearing a face mask works in an archeological dig, during the search for Irish nobleman Hugh O'Donnell in Valladolid, Spain May 29, 2020. REUTERS/Juan Medina

A view shows human remains found in an archeological dig, during the search for Irish nobleman Hugh O'Donnell in Valladolid, Spain May 29, 2020. REUTERS/Juan Medina

A view shows human remains found in an archeological dig, during the search for Irish nobleman Hugh O'Donnell in Valladolid, Spain May 29, 2020. REUTERS/Juan Medina

A view shows human remains found in an archeological dig, during the search for Irish nobleman Hugh O'Donnell in Valladolid, Spain May 29, 2020. REUTERS/Juan Medina

A view shows human remains found in an archeological dig, during the search for Irish nobleman Hugh O'Donnell in Valladolid, Spain May 29, 2020. REUTERS/Juan Medina

A view shows human remains found in an archeological dig, during the search for Irish nobleman Hugh O'Donnell in Valladolid, Spain May 29, 2020. REUTERS/Juan Medina

Massimo Osanna, director of archeological site of Pompeii, speaks during a news conference, as the place reopens to the public with social distancing and hygiene rules, after months of closure due to an outbreak of the coronavirus disease (COVID-19), in Pompeii, Italy, May 26, 2020. REUTERS/Ciro De Luca

Police officers wearing face masks are seen at the Templo Mayor archeological site after Mexico's government declared a health emergency on Monday and issued stricter rules to curb the spread of the coronavirus disease (COVID-19), in Mexico City, Mexico April 1, 2020. REUTERS/Gustavo Graf

Massimo Osanna, director of archeological sites of Pompei, with Italian Culture Minister Dario Franceschini, walks in one of three restored domus (ancient houses) that has reopened to the public at the archaeological site of Pompeii, Italy, February 18, 2020. REUTERS/Ciro De Luca

Archeologist Ruben Cabrera points at the remains of mural paintings on the walls of the Patio of the Jaguars at La Ventilla, one of the most extensively excavated neighborhoods in the ancient city of Teotihuacan, in San Juan Teotihuacan, on the outskirts of Mexico City, Mexico November 7, 2019. Picture taken November 7, 2019. REUTERS/Gustavo Graf

The remains of murals are seen at La Ventilla, one of the most extensively excavated neighborhoods in the ancient city of Teotihuacan, in San Juan Teotihuacan, on the outskirts of Mexico City, Mexico November 7, 2019. Picture taken November 7, 2019. REUTERS/Gustavo Graf

Archeologist Ruben Cabrera poses for a photo at La Ventilla, the neighborhood he has extensively excavated for over 20 years in the ancient city of Teotihuacan, in San Juan Teotihuacan, on the outskirts of Mexico City, Mexico November 7, 2019. Picture taken November 7, 2019. REUTERS/Gustavo Graf

Men work at one of the multi-family apartment compounds at La Ventilla, one of the most extensively excavated neighborhoods in the ancient city of Teotihuacan, in San Juan Teotihuacan, on the outskirts of Mexico City, Mexico November 7, 2019. Picture taken November 7, 2019. REUTERS/Gustavo Graf

Men work at one of the multi-family apartment compounds at La Ventilla, one of the most extensively excavated neighborhoods in the ancient city of Teotihuacan, in San Juan Teotihuacan, on the outskirts of Mexico City, Mexico November 7, 2019. Picture taken November 7, 2019. REUTERS/Gustavo Graf

Men work at one of the multi-family apartment compounds at La Ventilla, one of the most extensively excavated neighborhoods in the ancient city of Teotihuacan, in San Juan Teotihuacan, on the outskirts of Mexico City, Mexico November 7, 2019. Picture taken November 7, 2019. REUTERS/Gustavo Graf

A man works at one of the multi-family apartment compounds at La Ventilla, one of the most extensively excavated neighborhoods in the ancient city of Teotihuacan, in San Juan Teotihuacan, on the outskirts of Mexico City, Mexico November 7, 2019. Picture taken November 7, 2019. REUTERS/Gustavo Graf

Tourists are seen during a visit to the ancient city of Teotihuacan, with the Pyramid of the Sun in the background, in San Juan Teotihuacan, on the outskirts of Mexico City, Mexico October 31, 2019. Picture taken October 31, 2019. REUTERS/Gustavo Graf

A man works at one of the multi-family apartment compounds at La Ventilla, one of the most extensively excavated neighborhoods in the ancient city of Teotihuacan, in San Juan Teotihuacan, on the outskirts of Mexico City, Mexico November 7, 2019. Picture taken November 7, 2019. REUTERS/Gustavo Graf

A fragmented mural depicting a jaguar is seen on the walls of the Patio of the Jaguars at La Ventilla, one of the most extensively excavated neighborhoods in the ancient city of Teotihuacan, in San Juan Teotihuacan, on the outskirts of Mexico City, Mexico November 7, 2019. Picture taken November 7, 2019. REUTERS/Gustavo Graf

A man works at one of the multi-family apartment compounds at La Ventilla, one of the most extensively excavated neighborhoods in the ancient city of Teotihuacan, in San Juan Teotihuacan, on the outskirts of Mexico City, Mexico November 7, 2019. Picture taken November 7, 2019. REUTERS/Gustavo Graf

A man sweeps at one of the multi-family apartment compounds at La Ventilla, one of the most extensively excavated neighborhoods in the ancient city of Teotihuacan, in San Juan Teotihuacan, on the outskirts of Mexico City, Mexico November 7, 2019. Picture taken November 7, 2019. REUTERS/Gustavo Graf

Tourists are seen at the Avenue of the Dead in the ancient city of Teotihuacan, in San Juan Teotihuacan, on the outskirts of Mexico City, Mexico October 31, 2019. Picture taken October 31, 2019. REUTERS/Gustavo Graf

A mural depicting a heart and a sacrificial knife is pictured at the walls of the Plaza of the Chalchihuites at La Ventilla, one of the most extensively excavated neighborhoods in the ancient city of Teotihuacan, in San Juan Teotihuacan, on the outskirts of Mexico City, Mexico November 7, 2019. Picture taken November 7, 2019. REUTERS/Gustavo Graf

A man rests near the Temple of Hercules at Amman Citadel, an ancient Roman landmark in Amman, Jordan October 7, 2019. REUTERS/Amr Abdallah Dalsh

The moon is seen over houses and the Temple of Hercules at Amman Citadel, an ancient Roman landmark in Amman, Jordan October 7, 2019. REUTERS/Amr Abdallah Dalsh

An ancient stone-built tomb sits within an archaeological site near Qewaya village, Lake Titicaca, Bolivia, July 3, 2018. REUTERS/Manuel Seoane SEARCH "TITICACA CLIMATE" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

Plastic covers are seen at an area believed to contain the remains of enslaved people as archeological excavations are been conducted in Mount Vernon estate, home of George Washington, the first President of the United States, in Fairfax County, Virginia, U.S., August 15, 2019. Built using enslaved labor by George Washington's father, Augustine Washington in 1734, the house was inherited by George years later and expanded to almost 11,000 square feet with two and a half stories and a full cellar. REUTERS/Carlos Barria SEARCH "SLAVERY BUILDINGS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

Workers sift through diggings in the pit of an archeological dig at the "Historic Jamestowne" settlement with archeology director William Kelso (rear) in Jamestown, Virginia, May 4, 2007. Picture taken May 4, 2007. REUTERS/Jim Bourg

David M. Given, director of archeology at Jamestown Rediscovery, inspects artifacts at the Jamestown Rediscovery Center in Jamestown, Virginia, U.S., July 27, 2019. Picture taken July 27, 2019. REUTERS/Michael A. McCoy