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Overview of the Winter Palace (State Hermitage Museum), the Admiralty, and the St. Peter and Paul Fortress along the banks of the Neva River, St. Petersburg, Russia, Europe

Caernarfon Castle, UNESCO World Heritage Site, Caernarfon, Gwynedd, North Wales, Wales, United Kingdom, Europe

Tourist tram passing a bridge over Vltava River with view to Prague Castle in the background, Prague, Bohemia, Czech Republic, Europe

Elevated view from the Southern Garden at Prague Castle over the Old Town, UNESCO World Heritage Site, Prague, Czech Republic (Czechia), Europe

Church of Surb Astvatsatsin (Vahramashen Church) at Amberd fortress located on the slopes of Mount Aragats, Yerevan, Aragatsotn, Armenia, Central Asia, Asia

Amberd fortress located on the slopes of Mount Aragats, Yerevan, Aragatsotn, Armenia, Central Asia, Asia

Amberd fortress located on the slopes of Mount Aragats, Yerevan, Aragatsotn, Armenia, Central Asia, Asia

Water Gardens at Sigiriya Rock Fortress (Lion Rock), Sigiriya, North Central Province, Sri Lanka, Asia

Royal Bathing Pool at the top of Sigiriya Rock Fortress (Lion Rock), UNESCO World Heritage Site, Sigiriya, Sri Lanka, Asia

Montjuic Castle old military fortress on Montjuic Mountain overlooking the city, Barcelona, Catalonia, Spain, Europe

View to Wawel castle, UNESCO World Heritage Site, with restaurant boats moored on Wista (Vistula) River in riverside park, Krakow, Poland, Europe

Cannon and green hills, Brimstone Hill Fortress, UNESCO World Heritage Site, St. Kitts, St. Kitts and Nevis, West Indies, Caribbean, Central America

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

Saint Vitus Cathedral and Prague Castle seen from the Chotek Gardens, UNESCO World Heritage Site, Prague, Czech Republic (Czechia), Europe

Renaissance Summer Palace, Letohradek, built 1564, in autumn, Royal Gardens, Prague Castle, Hradcany, UNESCO World Heritage Site, Prague, Czechia, Europe

Ladies gallery, historic medieval Soutomaior Castle (Castelo de Soutomaior), Pontevedra, Galicia, Spain, Europe

The Couesnon River leading to the island of Mont Saint-Michel, UNESCO World Heritage Site, Normandy, France, Europe

Aerial image of the Tower of London, UNESCO World Heritage Site, London, England, United Kingdom, Europe

Mosaic floor, Byzantine Church, hill top palace complex, Masada fortress, UNESCO World Heritage Site, Israel, Middle East

Kristiansten Fortress and local architecture on the River Nidelva, Trondheim, Sor-Trondelag, Norway, Scandinavia, Europe

Looking across the calm waters of Havana Bay to Havana with the 16th century fortress, Morro Castle, standing guard, Havana, Cuba, West Indies, Caribbean, Central America

Kasbah Ait Ben Haddou and the Ounila River, UNESCO World Heritage Site, near Ouarzazate, Morocco, North Africa, Africa

Old cannons, Castillo de San Salvador de la Punta, Central Habana, Havana, Cuba, West Indies, Central America

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

Silhouette of Prague Castle and Saint Vitus Cathedral at sundown, UNESCO World Heritage Site, Prague, Czech Republic (Czechia), Europe

Spooky Halloween table interior decoration, Bran Castle (Dracula Castle), Bran, Transylvania, Romania, Europe

Medieval Malbork Castle, Marienburg Fortress of Mary, UNESCO World Heritage Site, Pomerania, Poland, Europe

Mount Orgueil Castle, overlooking Grouville Bay in Gorey, Jersey, Channel Islands, United Kingdom, Europe

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

Inside Kasbah Ait Ben Haddou, UNESCO World Heritage Site, near Ouarzazate, Morocco, North Africa, Africa

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

Prague skyline at night with Charles Bridge, River Vltava, Prague Castle and St. Vitus Cathedral, UNESCO World Heritage Site, Prague, Czech Republic, Europe

Roter Turm Tower, Wertheim Castle, Tauber River, Wertheim, Main Tauber District, Baden Wurttemberg, Germany, Europe

Bathing pool in rock palace fortress on rock summit, Sigiriya, UNESCO World Heritage Site, Central Province, Sri Lanka, Asia

Amberd fortress located on the slopes of Mount Aragats, with Mount Ararat in the distance, Yerevan, Aragatsotn, Armenia, Central Asia, Asia

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

Ruins of King Kassapa's Palace at the top of Sigiriya Rock Fortress (Lion Rock), UNESCO World Heritage Site, Sigiriya, Sri Lanka, Asia

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

Cannons on ramparts of citadel castle Il-Kastell, Victoria Rabat, Gozo, Malta, Mediterranean, Europe

Brimstone Hill Fortress, UNESCO World Heritage Site, St. Kitts, St. Kitts and Nevis, Leeward Islands, West Indies, Caribbean, Central America

Sunset over Brimstone Hill Fortress, UNESCO World Heritage Site, St. Kitts, St. Kitts and Nevis, Leeward Islands, West Indies, Caribbean, Central America

Fort Lovrijenac (St. Lawrence Fortress) at sunrise, Dubrovnik, Dalmatian Coast, Adriatic, Croatia, Europe

Kasbah Ait Ben Haddou and the Ounila River, UNESCO World Heritage Site, near Ouarzazate, Morocco, North Africa, Africa

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

Chateau de Duras castle, originally a 12th century fortress but by the 18th century was a retreat, Duras, Lot-et-Garonne, Aquitaine, France, Europe

Entrance gate with the old fortress of Corfu Town (Kerkyra) in the background at sunset, Corfu, Greek Islands, Greece, Europe