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View of Edinburgh Castle, Balmoral Hotel and Princes Street from Calton Hill at dusk, UNESCO World Heritage Site, Edinburgh, Lothian, Scotland, United Kingdom, 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

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

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

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

The Halaszbastya (Fisherman's Bastion) at night, located in the Buda Castle, in the 1st district of Budapest, UNESCO World Heritage Site, Budapest, Hungary, 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

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

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

Night view of Senglea, one of the Three Cities, and the Grand Harbour in Valletta, European Capital of Culture 2018, Valletta, Malta, Mediterranean, Europe

View of Hohensalzburg Castle from Mirabell Gardens, UNESCO World Heritage Site, Salzburg, Austria, 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

Liberty Gate, the Medieval Old Town of the City of Rhodes, UNESCO World Heritage Site, Rhodes, Dodecanese Islands, Greek Islands, Greece, 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

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 elevated position, London, England, United Kingdom, Europe

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

Greek Fortifications, southern city wall, Valle dei Templi (Valley of Temples), UNESCO World Heritage Site, Hellenic architecture, Agrigento, Sicily, Italy, Mediterranean, Europe

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 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

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

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

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

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 dusk, London, England, United Kingdom, Europe

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

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

Illuminated Prague Castle at dusk, 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

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

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

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

City Wall, originally built in the 12th century, Avila, UNESCO World Heritage Site, Castile and Leon, Spain, 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

Yard in the Palace of the Grand Master, the Medieval Old Town of the City of Rhodes, UNESCO World Heritage Site, Rhodes, Dodecanese Islands, Greek Islands, Greece, Europe

City Wall, originally built in the 12th century, Avila, UNESCO World Heritage Site, Castile and Leon, Spain, Europe

View of buildings along Ljubljanica River and Castle visible in background, Ljubljana, Slovenia, Europe

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

View from band stand shell to the New Castle on Schlossplatz Square, Stuttgart, Neckar Valley, Baden-Wurttemberg, Germany, Europe

Prague Castle and Charles Bridge on Vltava River at sunrise, 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