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The Couesnon River leading to the island of Mont Saint-Michel, UNESCO World Heritage Site, Normandy, France, Europe

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

Looking across the calm waters of Havana Bay to Havana with the 16th century fortress, Morro Castle, standing guard, Havana, Cuba, West Indies, Caribbean, Central America

Illuminated Prague Castle and St. Vitus Cathedral seen from the banks of Vltava River, UNESCO World Heritage Site, Prague, Bohemia, Czech Republic, Europe

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

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

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

Old Inverlochy Castle and Ben Nevis, Inverlochy, Fort William, Lochaber, Scotland, United Kingdom, Europe

Peter and Paul Fortress on Neva riverside, UNESCO World Heritage Site, St. Petersburg, Russia, Europe

Prague skyline at night with Charles Bridge, River Vltava, Prague Castle and St. Vitus Cathedral, UNESCO World Heritage Site, Prague, Czech Republic, Europe

Spanish colonial fortification, Fort de San Felipe, Bacalar, Quintana Roo, Yucatan Peninsula, Mexico, North America

Battle Abbey precinct, site of Battle of Hastings 1066, Battle, Sussex, England, United Kingdom, Europe

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

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

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

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

View of Hohensalzburg Castle and footbridge over Salzach River, UNESCO World Heritage Site, Salzburg, Austria, Europe

Elevated view from the Southern Garden at Prague Castle over the Old Town, UNESCO World Heritage Site, Prague, Czech Republic (Czechia), Europe

Baroque Waldstein Gardens and Prague Castle through spring blossom, Lesser Town (Mala Strana), 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

Cannons on ramparts of citadel castle Il-Kastell, Victoria Rabat, Gozo, Malta, Mediterranean, Europe

Riga Cathedral, St. Peter's Church, St. Saviour's Anglican Church and Riga Castle in Old Town at dusk, UNESCO World Heritage Site, Riga, Latvia, Europe

Tower of Mangana (Torre Mangana), on site of Moorish city, Cuenca, Castille La Mancha, Spain, Europe

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

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

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

Cannon around the ruined buildings at Fort Saint James, St. John's, Antigua, Antigua and Barbuda, Leeward Islands, West Indies, Caribbean, Central America

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

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

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