The ancient city of Ctesiphon with largest brick arch in the world, Ctesiphon, Iraq, Middle East

The ancient city of Ctesiphon with largest brick arch in the world, Ctesiphon, Iraq, Middle East

The ancient city of Ctesiphon with largest brick arch in the world, Ctesiphon, Iraq, Middle East

Palace of Darius the First, Persepolis, UNESCO World Heritage Site, Fars Province, Iran, Middle East

Achaemenid archaeological site, Propylon, Gate of All Nations, Persepolis, UNESCO World Heritage Site, Fars Province, Iran, Middle East

Achaemenid archaeological site, Propylon, Gate of All Nations, Persepolis, UNESCO World Heritage Site, Fars Province, Iran, Middle East

Achaemenid archaeological site, Propylon, Gate of All Nations, Persepolis, UNESCO World Heritage Site, Fars Province, Iran, Middle East

Pillars of the Apadana palace, Persepolis, UNESCO World Heritage Site, Fars Province, Iran, Middle East

Achaemenid archaeological site, Propylon, Gate of All Nations, Persepolis, UNESCO World Heritage Site, Fars Province, Iran, Middle East

Pillars of the Apadana palace, Persepolis, UNESCO World Heritage Site, Fars Province, Iran, Middle East

Pillars of the Apadana palace, Persepolis, UNESCO World Heritage Site, Fars Province, Iran, Middle East

Pillars of the Apadana palace, Persepolis, UNESCO World Heritage Site, Fars Province, Iran, Middle East

Pillars of the Apadana palace, Persepolis, UNESCO World Heritage Site, Fars Province, Iran, Middle East

Chichen Itza, UNESCO World Heritage Site, Yucatan, Mexico, North America

Chichen Itza, UNESCO World Heritage Site, Yucatan, Mexico, North America

Chichen Itza, UNESCO World Heritage Site, Yucatan, Mexico, North America

Rabsztyn Castle Ruins, Trail of the Eagles' Nests, Krakow-Czestochowa Upland (Polish Jura), Lesser Poland Voivodeship, Poland, Europe

Rabsztyn Castle Ruins, Trail of the Eagles' Nests, Krakow-Czestochowa Upland (Polish Jura), Lesser Poland Voivodeship, Poland, Europe

Archaeological Site of Olympia, UNESCO World Heritage Site, an ancient site on Greece's Peloponnese peninsula, Greece, Europe

Archaeological Site of Olympia, UNESCO World Heritage Site, an ancient site on Greece's Peloponnese peninsula, Greece, Europe

Remains of the Hadrian's Library and the old mosque in Monastiraki square, Athens, Greece, Europe

Elevated view of Roman Agora and Tower Of The Winds, Athens, Greece, Europe

Porch of Caryatids, Erechtheion Temple, Acropolis, UNESCO World Heritage Site, Athens, Greece, Europe

High angle view of Temple of Olympian Zeus, Hadrian's Arch and Athens city centre, Athens, Greece, Europe

Porch of Caryatids, Erechtheion Temple, Acropolis, UNESCO World Heritage Site, Athens, Greece, Europe

Acropolis of Athens, UNESCO World Heritage Site, Athens, Greece, Europe

Mow Cop Castle with stormy sky at sunset, Cheshire, England, United Kingdom, Europe

The Acropolis, UNESCO World Heritage Site, Athens, Greece, Europe

Temple of Kukulkan (El Castillo) pyramid, Chichen Itza Mayan ruins, UNESCO World Heritage Site, Yucatan, Mexico, North America

The Ossuary building, Tomb of the Great Priest, Chichen Itza, Mayan ruins, UNESCO World Heritage Site, Yucatan, Mexico, North America

People climbing El Torre (The Tower), Ek Balam Mayan ruins, near Vallodoid, Temozon, Yucatan, Mexico, North America

Temple of Kukulkan (El Castillo) pyramid, Chichen Itza Mayan ruins, UNESCO World Heritage Site, Yucatan, Mexico, North America

Scenic ruins of the Minoan Palace of Knossos, Knossos, Crete, Greek Islands, Greece, Europe

Arg-e Bam, Bam, Iran, Middle East

Structure 16, Mayan Archaeological Site, Yaxchilan, Chiapas, Mexico, North America

Murals, Room 1, Building 1, Mayan Archaeological Site, Bonampak, Chiapas, Mexico, North America

Murals, Room 1, Building 1, Mayan Archaeological Site, Bonampak, Chiapas, Mexico, North America

Eilean Donan Castle, Dornie, Lochalsh, Highland region, Scotland, United Kingdom, Europe

Qutab Minar Tower, UNESCO World Heritage Site, New Delhi, India, Asia

Belvedere Castle, Central Park, New York City, New York, United States of America, North America

Lindos Acropolis, Lindos, Rhodes, Dodecanese, Greek Islands, Greece, Europe

Ancient ruins of a Gothic abbey under a clear blue sky at Byland Abbey, North Yorkshire, England, United Kingdom, Europe

Structure 6, Kohunlich, Mayan archaeological site, Quintana Roo, Mexico, North America

Fortress of Frederick II of Swabia, Castel del Monte, Andria, Western Murge, Barletta, Apulia, Italy, Europe

Ruined building in the citadel area of Berat castle, UNESCO World Heritage Site, Berat, Albania, Europe

White Castle, Monmouthshire, Wales, United Kingdom, Europe

Angkor Wat Temple complex, UNESCO World Heritage Site, Angkor, Siem Reap, Cambodia, Indochina, Southeast Asia, Asia

The Roman period Odeon building, Apollonia Archaeological Park, Pojan, Albania, Europe

White storks, Palais Badi (El Badi Palace), Medina, Marrakesh, Morocco, North Africa, Africa

Roman amphitheater, Lecce, Salento, Apulia, Italy

The Temple of Re-Herakhte at Abu Simbel, UNESCO World Heritage Site, Nubia, Egypt, North Africa, Africa

Columns Building in the foreground, and Pyramid of the Magician beyond, Uxmal, Mayan archaeological site, UNESCO World Heritage Site, Yucatan, Mexico, North America

Parade of Shapur I, Naqsh-e Rajab, four Sassanid bas-reliefs of the third century, Region of Persepolis, Iran, Middle East

Jarlshof Prehistoric and Norse Settlement, 4000 years old, Sumburgh Head, Mainland, Shetland Islands, Scotland, United Kingdom, Europe

Temple of Panels (Templo de los Tableros Esculpidos), Mayan ruins, Chichen Itza, UNESCO World Heritage Site, Yucatan, Mexico, North America

Building L, Monte Alban, UNESCO World Heritage Site, Oaxaca, Mexico, North America

Wat Mahatat, Sukhothai Historical Park, UNESCO World Heritage Site, Sukhothai, Thailand, Southeast Asia, Asia

Standing Buddha statue in Atadage building in the Quadrangle, ancient city of Polonnaruwa, UNESCO World Heritage Site, Sri Lanka, Asia

Stone carving figures, Lankatilaka building, Alahana Pirivena complex, ancient city of Polonnaruwa, UNESCO World Heritage Site, Sri Lanka, Asia

Seated Buddha in Vatadage building, The Quadrangle, ancient city of Polonnaruwa, UNESCO World Heritage Site, Sri Lanka, Asia

The Lotus Mandapa building, The Quadrangle, ancient city of Polonnaruwa, UNESCO World Heritage Site, Sri Lanka, Asia

Ancient stone ruins on a grassy hill with overcast skies, North Yorkshire, England, United Kingdom, Europe

Ruins of Shafiabad caravanserai, Kerman Province, Iran, Middle East

Ruins of pre-Spanish Mahos village, Poblado de la Atalayita, Pozo Negro, Fuerteventura, Canary Islands, Spain, Atlantic, Europe

Ancient ruins under blue sky with clouds, historical architecture with arches and columns at Byland Abbey, North Yorkshire, England, United Kingdom, Europe

Building 2 in the foreground, Bonampak Archaeological Zone, Chiapas, Mexico, North America

Monster Mouth Doorway, Structure II, Hochob, Mayan archaeological site, Chenes style, Campeche, Mexico, North America

Yaxchilan Archaeological Zone, Chiapas, Mexico, North America

Sanctuary chapel building of Santiago de la Virgen De la Pena, Mijas, Malaga province, Andalusia, Spain, Europe

Entrance doorway in the Temenos wall to the sacred precinct, Apollonia Archaeological Park, Pojan, Albania, Europe

De Monti Castle (Castello de Monti), Corigliano d'Otranto, Lecce, Salento, Apulia, Italy

De Monti Castle (Castello de Monti), Corigliano d'Otranto, Lecce, Salento, Apulia, Italy

Castle of Carlo V, Lecce, Salento, Apulia, Italy

Church and Convent of Sant'Agostino, Massafra, Taranto, Apulia, Italiy

The Greek Amphitheatre and Mount Etna, Taormina, Sicily, Italy, Europe

Palace of the Governor, Uxmal, Mayan archaeological site, UNESCO World Heritage Site, Yucatan, Mexico, North America

Palace (Teocalli), Kabah Archaeological Site, Mayan Ruins, Puuc style, Yucatan, Mexico, North America

Stone Figure, Palace of the Masks (Codz Poop), Kabah Archaeological Site, Mayan Ruins, Puuc style, Yucatan, Mexico, North America

The tombs of Achaemenid kings at the historical Naqsh-e Rostam necropolis, Persepolis area, Iran, Middle East

Spinalonga Island, Elounda, Crete Island, Greek Islands, Greece, Europe

Elaborate decorated stone facade in Monjas complex, iglesia (church) building, Chichen Itza, UNESCO World Heritage Site, Yucatan, Mexico, North America

Roundhouse building, San Cibrao de Las hill fort, Castro Culture archaeological site, San Amaro, Ourense, Galicia, Spain, Europe

Temple of the Warriors, Chichen Itza, Mexico, Central America

Ruined city of Jiaohe, Turpan on the Silk Route, UNESCO World Heritage Site, Xinjiang Province, China, Asia

Dinefwr Castle, Llandeilo, Carmarthenshire, Wales, United Kingdom, Europe

Talley Abbey, near Llandeilo, Carmarthenshire, Wales, United Kingdom, Europe

Ruins of the old Synagogue in Capernaum by the Sea of Galilee, Israel, Middle East

Huge faces carved in stone, Bayon Temple, UNESCO World Heritage Site, Angkor, Siem Reap, Cambodia, Indochina, Southeast Asia, Asia

Old gold mine buildings, Rodalquilar, Cabo de Gata natural park, Almeria, Spain, Europe

The Chapel of Hathor at Hatshepsut's Mortuary Temple, Deir el-Bahri, Thebes, UNESCO World Heritage Site, Egypt, North Africa, Africa

Frieze, Nuns Quadrangle, Uxmal, Mayan archaeological site, UNESCO World Heritage Site, Yucatan, Mexico, North America

Nuns Quadrangle, Uxmal, Mayan archaeological site, UNESCO World Heritage Site, Yucatan, Mexico, North America

Stucco relief, Nuns Quadrangle, Uxmal, Mayan archaeological site, UNESCO World Heritage Site, Yucatan, Mexico, North America

Roman Forum, Cartagena, Murcia, Spain, Europe

Serpent Mouth, with Human Mask, Palace, Labna Archaeological Site, Mayan Ruins, Puuc style, Yucatan, Mexico, North America

Chac Rain God Stone Mask, Palace, Xlapak Archaeological Site, Mayan Ruins, Puuc style, Yucatan, Mexico, North America

Medes and Arachos priests, The Tachara, the Palace of Darius the exclusive building of Darius I, Persepolis, Iran, Middle East

South East tower and eastern part of Llawhaden Castle, Pembrokeshire, Wales, United Kingdom, Europe

Jarlshof Prehistoric and Norse Settlement, 4000 years old, Sumburgh Head, Mainland, Shetland Islands, Scotland, United Kingdom, Europe

Jarlshof Prehistoric and Norse Settlement, 4000 years old, Sumburgh Head, Mainland, Shetland Islands, Scotland, United Kingdom, Europe