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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

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

The 16th century Renaissance courtyard, Wawel Castle, UNESCO World Heritage Site, Krakow, Poland, 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

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

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

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, Carcassonne, UNESCO World Heritage Site, Languedoc-Roussillon, France, Europe

The Old Fort, Arabic fortress in Stone Town, UNESCO World Heritage Site, Zanzibar, Tanzania, East Africa, Africa

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

View of Edinburgh Castle, Balmoral Hotel and city skyline from Calton Hill at golden hour, Edinburgh, Lothian, Scotland, United Kingdom, 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 of the walled and fortified city of Elvas, UNESCO World Heritage Site, Alentejo, Portugal, 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

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

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

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

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

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

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

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

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

Illuminated Prague Castle at dusk, UNESCO World Heritage Site, Prague, Bohemia, Czech Republic (Czechia), Europe

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

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

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

Illuminated Prague Castle at twilight, UNESCO World Heritage Site, Prague, Bohemia, Czech Republic (Czechia), Europe

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

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

View of the ramparts of the Old City, UNESCO World Heritage Site, Essaouira, Morocco, North Africa, Africa

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

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

View of floating bars and nightclubs on Sava River across to Victor Monument at Belgrade Fortress, Belgrade, Serbia, Europe

The Citadel and old town of Bonifacio with the marina in the distance, Bonifacio, Corsica, France, Mediterranean, Europe

Prague Castle at night, UNESCO World Heritage Site, Prague, Bohemia, Czech Republic (Czechia), Europe

View towards the Saint Nicholas Fortress and Palace of the Grand Master of the Knights of Rhodes, UNESCO World Heritage Site, Rhodes City, Rhodes Island, Dodecanese, Greek Islands, Greece, Europe

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