Pre Rup Temple, a Hindu temple at Angkor built in 961 for Khmer king Rajendravarman of laterite and sandstone, UNESCO World Heritage Site, Cambodia, Indochina, Southeast Asia, Asia

Siena Cathedral unfinished facade, Siena, UNESCO World Heritage Site, Tuscany, Italy, Europe

Pompeii, UNESCO World Heritage Site, archaeological site of ancient city destroyed by Mount Vesuvius volcanic eruption, near Naples,Campania, Italy, Europe

Complex of Saqqara, UNESCO World Heritage Site, Egypt, North Africa, Africa

Temple of Amun, Temple complex of Karnak, UNESCO World Heritage Site, Thebes, Egypt, North Africa, Africa

The Temple of Ramesses II (The Ramesseum), UNESCO World Heritage Site, Thebes, Luxor, Egypt, North Africa, Africa

Temple of Kom Ombo, Egypt, North Africa, Africa

Egyptian Museum, Cairo, Egypt, North Africa, Africa

View of the Philopappos Monument, an ancient Greek mausoleum dedicated to Philopappus, a prince from the Kingdom of Commagene, Mouseion Hill, Athens, Greece, Europe

The bridge to Angkor Thom, lined on both sides with figurines ending in a corbelled arch entryway, Angkor, UNESCO World Heritage Site, Cambodia, Indochina, Southeast Asia, Asia

Cite de Carcassonne citadel, UNESCO World Heritage Site, Carcassonne, Aude, Occitania, France, Europe

Cite de Carcassonne citadel, UNESCO World Heritage Site, Carcassonne, Aude, Occitania, France, Europe

Aerial of the Roman Amphitheatre, UNESCO World Heritage Site, Orange, Vaucluse, Provence-Alpes-Cote d'Azur, France, Europe

Relief of Pharaoh, Tomb of Rameses III, KV11, Valley of the Kings, Ancient Thebes, UNESCO World Heritage Site, Luxor, Egypt, North Africa, Africa

The ruins of the ancient Roman and Byzantine city of Bet Shean, Bet Shean National Park, Israel

Archaeologists at work, Chichen Itza, UNESCO World Heritage Site, Yucatan, Mexico, North America

Roman mosaic floors at the Roman town of Conimbriga in Portugal

Roman remains at the Roman town of Conimbriga in Portugal