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

St. Mawes Castle, an artillery fortress built by Henry VIII, Cornwall, England, United Kingdom, Europe

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

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

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

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

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

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

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

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

Castillo de la Real Fuerza, La Habana Vieja, UNESCO World Heritage Site, Havana, Cuba, West Indies, Central America

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

View of Tower Bridge and the Tower of London, UNESCO World Heritage Site, from Cheval Three Quays at dusk, London, England, United Kingdom, Europe

View of the Tower of London, UNESCO World Heritage Site, from Cheval Three Quays at sunset, London, England, United Kingdom, Europe

View of the Tower of London, UNESCO World Heritage Site, and Tower Bridge from Cheval Three Quays at sunset, London, England, United Kingdom, Europe

Illuminated Prague Castle and St. Vitus Cathedral at dusk, UNESCO World Heritage Site, Prague, Bohemia, Czech Republic, Europe

View of the Tower of London, UNESCO World Heritage Site, and Tower Bridge from Cheval Three Quays at dusk, London, England, United Kingdom, Europe

Fort San Felipe at sunset, Puerto Plata, Dominican Republic, West Indies, Caribbean, Central America

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

Across the causeway to the main entrance to the 15th century Herstmonceux Castle, East Sussex, England, United Kingdom, Europe

The entrance gatetower to Battle Abbey, site of the Battle of Hastings, 1066, Battle, East Sussex, England, United Kingdom, Europe

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

View of Roughs Tower, the former defense plattform, a Maunsell Sea Fort, now the Principality of Sealand, North Sea, Europe