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Prague Castle, Charles Bridge, Mala Strana, and the Vltava River at twilight, UNESCO World Heritage Site, Prague, Czech Republic, Europe

Centuries Old Cannons, Havana Castle of the Royal Force (Castillo de la Real Fuerza), Havana Old Town, UNESCO, Havana, Cuba

Havana Castle of the Royal Force (Castillo de la Real Fuerza), Havana Old Town, UNESCO, Havana, Cuba

Castle of the Three Kings of Morro in foreground with Havana Skyline in the background), Havana, Cuba

Castle of the Three Kings of Morro in foreground, UNESCO, Havana Skyline in the background, Havana, Cuba

Lovrjenac Fort and Bokar Tower from Old Town City Walls, Dubrovnik, UNESCO World Heritage Site, Dalmatia, Croatia, Europe

Ovo Castle fortifications with canons at Castel dell Ovo islet fortress and city view at the Gulf of Napoli, Naples, Campania, Italy, Europe

Medieval citadel, Carcassonne, a hilltop town in southern France, UNESCO World Heritage Site, Carcassonne, Languedoc, France, Europe

Medieval citadel, Carcassonne, a hilltop town in southern France, UNESCO World Heritage Site, Carcassonne, Languedoc, France, Europe

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

View of Charles Bridge from Old Town Bridge Tower looking toward Mala Strana and Prague Castle, UNESCO World Heritage Site, Prague, Czech Republic, Europe

Venerable 9th century city walls with walkways, towers and scenic vantage points of Girona, Catalonia, Spain, Europe

Sunken City of Kekova seen from Simena Castle, Antalya Province, Lycia, Anatolia, Mediterranean Sea, Turkey, Asia Minor, Eurasia

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

The Tower of London, 11th century medieval Norman castle that houses the Crown Jewels, UNESCO World Heritage Site, City of London, London, England, United Kingdom, Europe

View of the City of Turin from the Castle of Rivoli (Castello di Rivoli), a former Residence of the Royal House of Savoy, housing the Museo d'Arte Contemporanea (Museum of Contemporary Art), Rivoli, Metropolitan City of Turin, Piedmont, Italy, Europe

View of the Castle of Rivoli (Castello di Rivoli), a former Residence of the Royal House of Savoy, UNESCO World Heritage Site, housing the Museo d'Arte Contemporanea (Museum of Contemporary Art), Rivoli, Metropolitan City of Turin, Piedmont, Italy, Europe

Albrechtsburg castle and the Gothic Cathedral dominating the city center, Meissen, Saxony, Germany, Europe

Aerial of the Cite de Carcassonne citadel, UNESCO World Heritage Site, Carcassonne, Aude, Occitania, France, Europe

The Old Dock Buildings at Bormla Waterfront with Fort St. Michael Clock Tower in the background at d, Cospicua, Malta

View of the Vicker's gun emplacement outside Stanley, the capital and only city in the Falkland Islands

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

View of the Akershus Fortress, cannons and city skyline from inside the walls on a sunny day, Oslo, Norway, Scandinavia, Europe

Cite de Carcassonne citadel, UNESCO World Heritage Site, Carcassonne, Aude, Occitania, France, Europe

View of Hishi Yagura and Hashizume-mon Gate, Kanazawa Castle, Kanazawa City, Ishikawa Prefecture, Honshu, Japan

Urban landscape featuring Belvedere Castle, a neo-Gothic structure on Vista Rock, Central Park, Manhattan Island, New York City, United States of America, North America

Urban landscape featuring Belvedere Castle, a neo-Gothic structure on Vista Rock, Central Park, Manhattan Island, New York City, United States of America, North America

Cite de Carcassonne citadel, UNESCO World Heritage Site, Carcassonne, Aude, Occitania, France, Europe

Castel Sant'Angelo (Mausoleum of Hadrian) seen from Janiculum Terrace at sunset, Rome, Lazio, Italy, Europe

View of the Akershus Fortress, cannons and city skyline from inside the walls on a sunny day, Oslo, Norway, Scandinavia, Europe

Cityscape of Rome featuring the Mausoleum of Hadrian (Castel Sant'Angelo) (Castle of the Holy Angel), a towering rotunda (cylindrical building) in Parco Adriano, UNESCO World Heritage Site, Rome, Italy, Europe

Castel Nuovo, the historic Centre of Naples (Napoli), UNESCO World Heritage Site, Campania, Italy, Europe

Senglea, one of the Three Cities, and the Grand Harbour in Valletta, UNESCO World Heritage Site and European Capital of Culture 2018, Malta, Mediterranean, Europe

Queens Guards at Jewel House, The Tower of London, UNESCO World Heritage Site, London, England, 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

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

Xativa castle at dusk, at a height of 310 metres above the modern-day city, Xativa, Valencia, Spain, Europe

Ponte Castelvecchio, Castelvecchio brick and marble bridge with arches on the River Adige, Verona, Veneto, Italy, 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 Castle, Balmoral Hotel and Princes Street from Calton Hill, Edinburgh, 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 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

Reflections in the glass on the ground in Kale city park and Erzurum Byzantine Castle, Anatolia, Turkey, Asia Minor, Asia

Gate d'Amboise, the Medieval Old Town, UNESCO World Heritage Site, City of Rhodes, Rhodes, Dodecanese Islands, Greek Islands, Greece, Europe

Aerial drone view of Baixa District, facing south towards the Tagus River with the major landmarks visible including St. George Castle, Pantheon, Figueira, Rossio Square, Martim Moniz Squares, Lisbon, Portugal, Europe

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

View of Edinburgh Castle, Balmoral Hotel and Dugald Stewart monument from Calton Hill at golden hour, 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

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

Xativa castle at dusk, at a height of 310 metres above the modern-day city, Xativa, Valencia, Spain, Europe

View over Stolberg with St. Martini church, Saigerturm tower and castle, Harz, Saxony-Anhalt, Germany, Europe

River view with bridge and Castelvecchio castle, a Middle Ages red brick castle on the right bank of River Adige, Verona, Veneto, Italy, Europe

City of London skyscrapers and the Tower of London viewed across the River Thames, London, England, United Kingdom, 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 Edinburgh Castle, Balmoral Hotel and Princes Street from Calton Hill at dusk, UNESCO World Heritage Site, Edinburgh, Lothian, Scotland, United Kingdom, 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

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

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

Night low angle view of illuminated defensive wall fortification in front of traditional low-rise roof-tiled houses and passing clouds above in the Old Town of Warsaw, Poland, Europe

View of Castle, Balmoral Hotel and Princes Street from Calton Hill, Edinburgh, Scotland, United Kingdom, Europe

Panorama of Prague Castle, Hradcany, Mala Strana, and Charles Bridge lit by sunrise, UNESCO World Heritage Site, Prague, Czech Republic, Europe