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

Entrance to the Fortaleza de Sao Miguel (St. Michael Fortress) now the Museum of the Armed Forces, Luanda, Angola, Africa

Elevated view from the Southern Garden at Prague Castle over the Old Town, 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

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

Biertan Fortified Church, 15th century, UNESCO World Heritage Site, Biertan, Sibiu County, Romania, Europe

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

View from Krizovnicke Square to the Mala Strana District and Prague Castle, Prague, Bohemia, Czech Republic, Europe

Tourists walking over moat bridge through entrance gateway of medieval city of Mdina, Malta, Mediterranean, Europe

Baroque Waldstein Gardens and Prague Castle through spring blossom, Lesser Town (Mala Strana), Prague, Czechia, Europe

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

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

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

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

Fagaras Citadel and Romanian Orthodox Cathedral in background, Fagaras, Transylvania, Romania, Europe

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

Hever Castle, 13th century double moated castle, and childhood home of Anne Boleyn, Kent, England, United Kingdom, Europe

Old Fortress, Kerkyra city, UNESCO World Heritage Site, Corfu, Ionian Islands, Greek Islands, Greece, Europe

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

Wawel Hill Castle and Cathedral, Vistula River with swans, UNESCO World Heritage Site, Krakow, Poland, Europe

Riga Cathedral, St. Peter's Church, St. Saviour's Anglican Church and Riga Castle in Old Town at dusk, UNESCO World Heritage Site, Riga, Latvia, Europe

Gateway entrance of the Medina shopping and restaurant complex, Yasmine Hammamet, Cap Bon, Tunisia, North Africa, Africa

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

Stokesay Castle, a fortified medieval manor house in spring sunshine, Shropshire, England, United Kingdom, Europe

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

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

The colorful castle of Palacio da Pena, UNESCO World Heritage Site, on top of hill Sao Pedro de Penaferrim, Sintra, Lisbon district, Portugal, Europe

Fortified walls and towers of the Aljaferia palace dating from the 11th century, Saragossa (Zaragoza), Aragon, Spain, Europe