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View of the Mausoleum of Hadrian (Saint Angelo's Castle), Parco Adriano, UNESCO World Heritage Site, Rome, Lazio, Italy, Europe

Prague Castle and St. Vitus Cathedral in morning sunlight, UNESCO World Heritage Site, Prague, Czechia (Czech Republic), Europe

Tourists visit the ancient city of Sigiriya, with carvings on a rock in a mountain fortress, UNESCO World Heritage Site, Sri Lanka, Asia

View of Alhambra, UNESCO World Heritage Site, and Sierra Nevada mountains, Granada, Andalucia, Spain, Europe

A section of the wall of the Citadel of Bonifacio perched on rugged cliffs, Bonifacio, Corsica, France, Mediterranean, Europe

View of Edinburgh Castle, Balmoral Hotel and Dugald Stewart monument from Calton Hill at dusk, UNESCO World Heritage Site, Edinburgh, Lothian, Scotland, United Kingdom, Europe

View of the Valentino Castle (Castello del Valentino), UNESCO World Heritage Site, situated in Parco del Valentino, the seat of the Architecture Faculty of the Polytechnic University of Turin, Turin, Piedmont, Italy, Europe

Prague Castle and St. Vitus Cathedral in morning sunlight, UNESCO World Heritage Site, Prague, Czechia (Czech Republic), Europe

La Cite, medieval fortress city, Carcassonne, UNESCO World Heritage Site, Languedoc-Roussillon, France, Europe

Fort Carre and Antibes Harbour at sunrise, Provence-Alpes-Cote d'Azur, French Riviera, France, Mediterranean, Europe

Castillo de la Real Fuerza in La Habana Vieja, UNESCO World Heritage Site, Old Havana, La Habana (Havana), Cuba, West Indies, Caribbean, Central America

Besalu historic medieval city with Catalonia flags on the stone bridge tower crossing El Fluvia river, Besalu, Catalonia, Spain, Europe

View of Castello Sforzesco (Sforza's Castle), a medieval fortification dating back to the 15th century, now housing museums and art collections, Milan, Lombardy, Italy, Europe

Fort St. Angelo, dating from the medieval period and used by the British between 1800 and 1979, Birgu, Malta, Mediterranean, Europe

Castillo Real de la Fuerza moat and fortification, city of Havana, Cuba, West Indies, Central America

La Cite, medieval fortress city, Carcassonne, UNESCO World Heritage Site, Languedoc-Roussillon, France, Europe

View of Edinburgh Castle, Balmoral Hotel and city skyline from Calton Hill at golden hour, Edinburgh, Lothian, Scotland, United Kingdom, Europe

Prague Castle and Charles Bridge on Vltava River in city, UNESCO World Heritage Site, Prague, Bohemia, Czech Republic (Czechia), Europe

View of the Valentino Castle (Castello del Valentino), UNESCO World Heritage Site, situated in Parco del Valentino, the seat of the Architecture Faculty of the Polytechnic University of Turin, Turin, Piedmont, Italy, Europe

View of Castello Sforzesco (Sforza's Castle), a medieval fortification dating back to the 15th century, now housing museums and art collections, Milan, Lombardy, Italy, Europe

Detail of Castello Sforzesco (Sforza's Castle), a medieval fortification dating back to the 15th century, now housing museums and art collections, Milan, Lombardy, Italy, Europe

Besalu historic medieval city with Catalonia flags on the stone bridge tower crossing El Fluvia river, Besalu, Catalonia, Spain, Europe

La Cite, medieval fortress city, bridge over River Aude, Carcassonne, UNESCO World Heritage Site, Languedoc-Roussillon, France, Europe

The Citadel and old town of Bonifacio perched on rugged cliffs, Bonifacio, Corsica, France, Mediterranean, Europe

Old Venetian Port and The Koules Fortress at sunset, City of Heraklion, Crete, Greek Islands, Greece, Europe

Tourists visit the ancient city of Sigiriya, with carvings on a rock in a mountain fortress, UNESCO World Heritage Site, Sri Lanka, Asia

Fort Carre and Antibes Harbour, Provence-Alpes-Cote d'Azur, French Riviera, France, Mediterranean, Europe

The Citadel and old town of Bonifacio perched on rugged cliffs, Bonifacio, Corsica, France, Mediterranean, Europe

Defensive Wall and Palace of the Grand Master of the Knights of Rhodes, UNESCO World Heritage Site, Medieval Old Town, Rhodes City, Rhodes Island, Dodecanese, Greek Islands, Greece, Europe

View over Ibrahim Pasha Mosque Minaret and Medieval Old Town towards Saint Nicholas Fortress at dusk, Rhodes City, Rhodes Island, Dodecanese, Greek Islands, Greece, Europe

Cityscape of Narni at sunrise, with the fortress at the front and the old town beyond, Narni, Umbria, Italy, Europe

La Cite, medieval fortress city, bridge over River Aude, Carcassonne, UNESCO World Heritage Site, Languedoc-Roussillon, France, Europe

Great Kalemegdan staircase leading to The Victor Monument, Belgrade Fortress, Belgrade, Serbia, Europe

Road Train Tour at the Venetian Fortezza Castle, City of Rethymno, Rethymno Region, Crete, Greek Islands, Greece, Europe

Defensive Wall and Palace of the Grand Master of the Knights of Rhodes, UNESCO World Heritage Site, Medieval Old Town, Rhodes City, Rhodes Island, Dodecanese, Greek Islands, Greece, Europe

Heidelberg Castle, Courtyard with the Friedrich building, Heidelberg, Baden Wurttemberg, Germany, Europe

Old city walls, medieval architecture, Rhodes City, UNESCO World Heritage Site, Rhodes, Dodecanese Islands, Greece, Europe

Prague Castle and St. Vitus Cathedral at dawn from Petrin Hill, UNESCO World Heritage Site, Prague, Czechia (Czech Republic), Europe

La Cite, medieval fortress city, bridge over River Aude, Carcassonne, UNESCO World Heritage Site, Languedoc-Roussillon, France, Europe

La Cite, medieval fortress city, Carcassonne, UNESCO World Heritage Site, Languedoc-Roussillon, France, Europe

View of the Tower of London, UNESCO World Heritage Site, and Tower Bridge from elevated position, London, England, United Kingdom, Europe

Prague Castle and Charles Bridge on Vltava River at sunrise, UNESCO World Heritage Site, Prague, Bohemia, Czech Republic (Czechia), Europe

Heidelberg Castle, Friedrich Wing, Pharmacy Museum of Germany and glass hall arcade, Heidelberg, Baden Wurttemberg, Germany, Europe

Kasbah Ait Benhaddou, an ancient fortified village (Ksar) on the old caravan route between the Sahara Desert and Marrakech, UNESCO World Heritage Site, Morocco, North Africa, Africa

Whole cityscape of Spoleto, with the Roman aqueduct, the fortress and the old town, Spoleto, Umbria, Italy, Europe