Orlovi Skali, Bulgaria
Chauteau de Kerjean, in the region of Brittany, France
Apennine Colossus, Italy 1580
Ark Fortress, Bukhara, Uzbekistan
Château de Bonaguil, France
Black Middens Bastle House, a fortified farmhouse, UK
Belogradchik Fortress, Bulgaria
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Cantalloc Aqueducts, Peru
Dzordzor Chapel, Iran
Front row seats at the Theatre of Dionysos, Athens, Greece
Remains of King Herod's Palace, near Bethlehem, Palestine
Castello Aragonese, Italy
Beseno Castle, Italy
Dunnottar Castle, Scotland
Roman bath in Gafsa, Tunisia, still in use
Taq Kasra, remains of the Persian capital of Ctesiphon, modern-day Iraq
Remains of a Roman military latrine along Hadrian's Wall, Britain
Luxor Temple, Egypt
Inside of the Roman Delikkemer aqueduct in modern-day Turkiye
Lohagad Fort, India
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Hattusa, capital of the Hittites, Turkiye, with reconstruction illustration
Hittite rampart in Hattusa, Turkiye
Temple of Hephaestus (god of industry), Athens, Greece
Hashima Island, once a site for working undersea coal mines, Japan
Stairs in Kuelap Fortress, Peru
Genoese fortress in Sudak, Crimea, Ukraine
Remains of an Inca Empire rest post in Peru
Dolmen of Guadalperal, Spain
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Overgrown remains of Ballymarkahan Castle, Ireland
Ancient Roman thermal baths in Paris, France
Walls of Constantinople, modern-day Istanbul, with diagram
Cahir Castle, Ireland
Roman-era temple in Baalbek, Lebanon
Medieval bridge in Wycoller, England
Chapel Santa Cruz, Oran, Algeria
Carvings by a 18th century AD quarry worker in the Catacombs of Paris
Fort Tolukko, Indonesia
Pre-Inca sarcophagi in Carajía, Peru
Castle of Coca, Spain
Tidal island and castle of St. Michael's Mount, Penzance, Cornwall, UK