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View of walled city of Mdina, with dome of Saint Paul's Cathedral under scaffolding, Mdina, Malta, Mediterranean, Europe

Historic hilltop walled medieval village of Mertola with castle and fortified walls, Baixo Alentejo, Portugal, 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

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

Swimming pool at Ksar El Kabbaba, former kasbah (grand fortified house), now a hotel, Skoura, Morocco, North Africa, Africa

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

Roof decoration of Prague Castle, towers of St. Vitus Cathedral and moon, Hradcany Square, Hradcany,UNESCO World Heritage Site, Prague, Czechia, Europe

Gothic Saint Vitus Cathedral and Prague Castle, Hradcany, UNESCO World Heritage Site, Prague, Czechia, Europe

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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