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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

Burg Kreuzenstein castle, Leobendorf, Weinviertel Region, Lower Austria, near Vienna, Austria, Europe

Fort Monroe Pioneer Memorial, Chinatown, Los Angeles, California, United States of America, North America

Fort Lauderdale beach, Fort Lauderdale, Broward County, Florida, United States of America, North America

High angle view of San Vito Lo Capo historic district, San Vito Lo Capo, Sicily, Italy, Mediterranean, Europe

Renaissance Summer Palace, Letohradek, built 1564, in autumn, Royal Gardens, Prague Castle, Hradcany, UNESCO World Heritage Site, Prague, Czechia, Europe

Fort Church in Fort Amsterdam, Punda District, Willemstad, Curacao, Netherlands Antillies, West Indies, Caribbean, Central America

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

View to the Alhambra through arch in gardens of the Generalife, UNESCO World Heritage Site, Granada, Andalucia (Andalusia), Spain, Europe

Lower falls on the Water of Nevis in autumn, Glen Nevis, near Fort William, Highlands, Scotland, United Kingdom, Europe

Panoramic view of Black Rock Cottage with Buachaille Etive Mor in distance on snow covered Rannoch Moor, near Fort William, Highland, Scotland, United Kingdom, Europe

Fort Union National Monument and Santa Fe National Historic Trail, New Mexico, United States of America, North America

Fort Amsterdam in Willemstad, UNESCO World Heritage Site, Curacao, ABC Islands, Netherlands Antilles, Caribbean, Central America

Wawel Castle, UNESCO World Heritage Site, reflected in Vistula River, at night, Krakow, Poland, Europe

Fort Napoleon, Bourg des Saintes, Terre de Haut, Iles Des Saintes, Les Saintes, Guadeloupe, Leeward Islands, West Indies, Caribbean, Central America

Spanish colonial military architecture, Fort San Jose el Alto, Campeche, UNESCO World Heritage Site, State of Campeche, Mexico, North America

The medieval castle built between the 11th and 15th centuries and the Anglin River, Angles sur l'Anglin, Vienne, Poitou-Charentes, France, Europe

The Fort of Nossa Senhora da Penha de Franca, popularly known as the Fortaleza Ponta da Bandeira, built towards the end of the 17th century to defend the harbour, Lagos, Algarve, Portugal, Europe

D'Estr•À?es Fort now a museum of slavery, Goree Island, UNESCO World Heritage Site, near Dakar, Senegal, West Africa, Africa

Elevated view from Kamerlengo Fortress over the old town of Trogir at dusk, UNESCO World Heritage Site, Croatia, Europe

Aerial image of Beacon Hill, an Iron Age hill fort, Burghclere, Hampshire, England, United Kingdom, Europe

Remains of buildings at Fort Union National Monument, New Mexico, United States of America, North America

Old wagon wheels with remnants of Fort Union behind, Fort Union National Monument, New Mexico, United States of America, North America

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

Castle Stahleck above the village of Bacharach in the Rhine valley, Rhineland-Palatinate, Germany, Europe

Tourists in St. Stephens Square, with the Spanish Fort (Fortica) above, Hvar Town, Hvar Island, Dalmatian Coast, Croatia, Europe

Hvar Fortress cannon and Hvar Town at sunset taken from the Spanish Fort (Fortica), Hvar Island, Dalmatian Coast, Adriatic, Croatia, Europe

The site of the Commandants House showing supports for suspended floor system with hot air to heat rooms above, dating from AD138, Cilurnum (Chesters Roman Fort), Hadrian's Wall, UNESCO World Heritage Site, Chollerford, Northumbria National Park, England, United Kingdom, Europe

San Pedro de la Roca Castle, UNESCO World Heritage Site, Santiago de Cuba, Santiago de Cuba Province, Cuba, West Indies, Caribbean, Central America

Wawel Hill Castle and Cathedral, Vistula River with swans, UNESCO World Heritage Site, Krakow, Poland, Europe

Old cannon, Ramparts of San Felipe Fort, built in 1733, Laguna Bacalar, Quintana Roo, Mexico, North America

View at dawnfrom the Lovrijenac Fortress over the walled old town of Dubrovnik, UNESCO World Heritage Site, Croatia, Europe

The Lovrijenac Fortress (St. Lawrence Fortress) outside the old town of Dubrovnik at sunset, Croatia, Europe

The Folly at Mow Cop illuminated by amazing sunset, Mow Cop, Cheshire, England, United Kingdom, Europe

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