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Monastery of St. John the Theologian, fortress and Hora, UNESCO World Heritage Site, Skala, Patmos, Dodecanese, Greek Islands, Greece, Europe

Castle of Lykourgos Logothetis, Pythagorio, Samos, North Aegean Islands, Greek Islands, Greece, Europe

Porte d'Aude through outer wall of old city, Carcassonne, UNESCO World Heritage Site, Languedoc, France, Europe

Cathedral church tower and ruins inside citadel castle walls Il-Kastell, Victoria Rabat, Gozo, Malta, Mediterranean, Europe

Storage alcoves in the changing room of the Roman Baths, dating from AD 138, Cilurnum (Chesters Roman Fort), Hadrian's Wall, UNESCO World Heritage Site, Chollerford, Northumbrian National Park, England, United Kingdom, Europe

The ancient Kasbah Ait Benhaddou bathed in morning light and reflecting in river, UNESCO World Heritage Site, near Ouarzazate, Morocco, North Africa, Africa

Covered cenote well at convent of San Bernardino of Sienna, Valladolid, Yucatan, Mexico, North America

Dunbeg Fort, possibly Bronze Age, Dingle Peninsula, County Kerry, Munster, Republic of Ireland, Europe

Large wrought stones recovered from the site of the Roman Bridge that spanned the River North Tyne dating from AD 138, Cilurnum (Chesters Roman Fort), Hadrian's Wall, UNESCO World Heritage Site, Chollerford, Northumbria National Park, England, United Kingdom, Europe

Aerial image of Deal Castle, a Device fort (Henrician Castle) built by Hentry VIII, Deal, Kent, England, United Kingdom, Europe

View of a section of the Great Wall, UNESCO World Heritage Site, between Jinshanling and Simatai near Beijing, China, Asia

Hovenweep Castle, Square Tower Group, Anasazi Ruins, dating from AD1230 to 1275, Hovenweep National Monument, Utah, United States of America, North America

El Morro Fortress (Castillo de los Tres Reyes Magos del Morro) built in 1589, a picturesque fortress guarding the entrance to Havana Bay, Havana, Cuba, West Indies, Central America

Typical Dodecanese white houses and the Acropolis above Lindos, Rhodes, Dodecanese Islands, Greek Islands, Greece, Europe

Qalaat Ibn Maan, 17th century Arab Castle overlooking the Graeco-Roman city, Palmyra, Syria, Middle East

Walls of the citadel, historic former political capital, Hue, central Vietnam, Indochina, Southeast Asia, Asia

People on the Badaling section, the Great Wall of China, UNESCO World Heritage Site, near Beijing, China, Asia

Jinshanling section of the Great Wall of China, UNESCO World Heritage Site, near Beijing, China, Asia

Bell tower against sky with clouds on top of a church at Agia Mavra Fort, Lefkada, Ionian Island, Greek Islands, Greece, Europe

Cityscape of Rome featuring the Mausoleum of Hadrian (Castel Sant'Angelo) (Castle of the Holy Angel), a towering rotunda (cylindrical building) in Parco Adriano, UNESCO World Heritage Site, Rome, Italy, Europe

Castle of the Three Kings of Morro in foreground, UNESCO, Havana Skyline in the background, Havana, Cuba

Bluebells at the ancient fort of Blackbury Camp near Sidmouth, Devon, England, United Kingdom, Europe

Ancient fortress (Ksar), Ait Ben Haddou, UNESCO World Heritage Site, Ouarzazate province, Morocco, North Africa, Africa

Ruins of the archaelogical site of Panama Viejo, UNESCO World Heritage Site, Panama City, Republic of Panama, Central America

Jinshanling section of the Great Wall of China, UNESCO World Heritage Site, near Beijing, China, Asia

Aerial drone panoramic view of Fort of Nossa Senhora da Rocha (Fort of Our Lady of the Rock) (Castle of Porches), Porches, Lagoa, Algarve, Portugal

Ancient wall of the Fort Silver Indian Ruins overlooking Silver Creek Canyon in Agua Fria National Monument of Arizona. Located near the Pueblo La Plata ruins.

People on the Badaling section, the Great Wall of China, UNESCO World Heritage Site, near Beijing, China, Asia

Aerial of the historic Bridge of Saint Benezet (Pont d'Avignon) with the historic city, Avignon, UNESCO World Heritage Site, Vaucluse, Provence-Alpes-Cote d'Azur, France, Europe

Aerial drone panoramic view of Fort of Nossa Senhora da Rocha (Fort of Our Lady of the Rock) (Castle of Porches), Porches, Lagoa, Algarve, Portugal

Ancient wall of the Fort Silver Indian Ruins overlooking Silver Creek Canyon in Agua Fria National Monument of Arizona. Located near the Pueblo La Plata ruins.

San Giovanni di Sinis historic tower, drone aerial view of San Marco Cape at sunset, Sardinia, Italy, Mediterranean, Europe

View of Kavala from ferry, Kavala, Dimos Kavalas, Eastern Macedonia and Thrace, Gulf of Thasos, Gulf of Kavala, Greece, Europe

Urban landscape of Lourdes, market town in the Pyrenees, Chateau Fort in background, Lourdes, Hautes-Pyrenees, Occitanie, France