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Crac des Chevaliers, Crusader castle, 1150-1250, built by the Knights Hospitaller, Syria, Middle East

Old Town Barbican defensive bastion built in 1498, Krakow (Cracow), UNESCO World Heritage Site, Poland, Europe

White sand beach and turquoise waters in front of Fort Jefferson, Dry Tortugas National Park, Florida Keys, Florida, United States of America, North America

Turquoise waters and white sand beach in front of Fort Jefferson, Dry Tortugas National Park, Florida Keys, Florida, United States of America, North America

Old Fortress, Kerkyra city, UNESCO World Heritage Site, Corfu, Ionian Islands, Greek Islands, Greece, Europe

Fort Jefferson, Dry Tortugas National Park, Florida Keys, Florida, United States of America, North America

Skansin fort, old fort guarding Torshavn and its harbour (old brass cannons, WW2 british marine guns and lighthouse), Nolsoy in the distance, Torshavn, Streymoy, Faroe islands (Faroes), Denmark, Europe.

High angle view of the old town, UNESCO World Heritage Site, with Hohensalzburg Fortress, Dom Cathedral and Kappuzinerkirche Church at dusk, Salzburg, Salzburger Land, Austria, Europe

High angle view of the Old Town, UNESCO World Heritage Site, with Hohensalzburg Fortress, Dom Cathedral and Kappuzinerkirche Church, Salzburg, Salzburger Land, Austria, Europe

High angle view of the old town, UNESCO World Heritage Site, with Hohensalzburg Fortress, Dom Cathedral and Kappuzinerkirche Church at dusk, Salzburg, Salzburger Land, Austria, Europe

High angle view of the Old Town, UNESCO World Heritage Site, with Hohensalzburg Fortress, Dom Cathedral and Kappuzinerkirche Church, Salzburg, Salzburger Land, Austria, Europe

High angle view of the Old Town, UNESCO World Heritage Site, with Hohensalzburg Fortress and Dom Cathedral at dusk, Salzburg, Salzburger Land, Austria, Europe

High angle view of the Old Town, UNESCO World Heritage Site, with Hohensalzburg Fortress, Dom Cathedral and Kappuzinerkirche Church, Salzburg, Salzburger Land, Austria, Europe

High angle view of the Old Town, UNESCO World Heritage Site, with Hohensalzburg Fortress, Dom Cathedral and Kappuzinerkirche Church, Salzburg, Salzburger Land, Austria, Europe

High angle view of the Old Town, UNESCO World Heritage Site, with Hohensalzburg Fortress, Dom Cathedral and Kappuzinerkirche Church, Salzburg, Salzburger Land, Austria, Europe

Kotor Old Town and fortifications at dawn with the Church of our Lady of Remedy in the foreground, Bay of Kotor, UNESCO World Heritage Site, Montenegro, Europe

Kotor Old Town and fortifications at sunrise, Bay of Kotor, UNESCO World Heritage Site, Montenegro, Europe

Water Gardens in the Royal Gardens at Sigiriya Rock Fortress (Lion Rock), UNESCO World Heritage Site, Sigiriya, Sri Lanka, Asia

Royal Bathing Pool at the top of Sigiriya Rock Fortress (Lion Rock), UNESCO World Heritage Site, Sigiriya, Sri Lanka, Asia

Tourist at Sigiriya Rock Fortress (Lion Rock), UNESCO World Heritage Site, Sigiriya, Cultural Triangle, Sri Lanka, Asia

Kristiansten Fortress and local architecture on the River Nidelva, Trondheim, Sor-Trondelag, Norway, Scandinavia, Europe

Mandalay City Fort and Palace reflected in the moat surrrounding the compound at night, Mandalay, Myanmar (Burma), Asia

Flowers frame old mystical buildings of Romanesque Gothic and Renaissance style, Quinta da Regaleira, Sintra, Portugal, Europe

Medieval stone tower on a grassy hill with clear blue sky, flanked by church spires in the background, Clifford's Tower, York, North Yorkshire, England, United Kingdom, Europe

The city wall of Mehrangarh Fort towering over the blue rooftops in Jodhpur, the Blue City, Rajasthan, India, Asia

Fortified Ibiza Old Town (Dalt Vila), UNESCO World Heritage Site, Ibiza, Balearic Islands, Spain, Europe

Aerial view by drone of Rethymno old town, Venetian Harbour and fortress, Crete Island, Greek Islands, Greece, Europe

Trogir's historic Stari Grad (Old Town) defensive walls and harbour, Trogir, Dalmatia, Croatia, Europe

The Kings Tower at Knaresborough Castle in the snow Knaresborough, Yorkshire, England, United Kingdom, Europe

The Kings Tower at Knaresborough Castle in the snow Knaresborough, Yorkshire, England, United Kingdom, Europe

Giant statue of Mubarek Ahmed Sharafaddin in front of the citadel of Erbil (Hawler), capital of Iraq Kurdistan, Iraq, Middle East

Hvar Town and tourists at Hvar Spanish Fort (Fortica) at sunset, Hvar Island, Dalmatian Coast, Adriatic, Croatia, Europe

Fort Lovrijenac (St. Lawrence Fortress) at sunrise, Dubrovnik, Dalmatian Coast, Adriatic, Croatia, Europe

Dubrovnik and the City Walls at sunrise, from Fort Lovrijenac (St. Lawrence Fortress), Dubrovnik, Dalmatian Coast, Adriatic, Croatia, Europe

Sunrise on Hadrian's Wall National Trail in winter, looking to Housesteads Fort, Hadrian's Wall, UNESCO World Heritage Site, Northumberland, England, United Kingdom, Europe

Sunrise and Hadrian's Wall National Trail in winter, looking to Housesteads Fort, Hadrian's Wall, UNESCO World Heritage Site, Northumberland, England, United Kingdom, Europe

View along the rampart walls to Flag Rock, one of the former Portuguese bastions at the old Dutch Fort, UNESCO World Heritage Site, Galle, Sri Lanka, Asia

Meeran Jumma Mosque and the lighthouse at the Point Utrecht Bastion in the old Dutch Fort, UNESCO World Heritage Site, Galle, Southern Province, Sri Lanka, Asia

Woman hiding in the entranceway of Mehrangarh Fort in Jodhpur, the Blue City, Rajasthan, India, Asia

Artillery at Forte de Copacabana (Copacabana Fort), Copacabana, Rio de Janeiro, Brazil, South America

Caernarfon Castle, UNESCO World Heritage Site, Caernarfon, Gwynedd, North Wales, Wales, United Kingdom, Europe

Caernarfon Castle, UNESCO World Heritage Site, Caernarfon, Gwynedd, North Wales, Wales, United Kingdom, Europe