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Old Town Barbican defensive bastion built in 1498, Krakow (Cracow), UNESCO World Heritage Site, Poland, Europe

View from the Castle (El Castillo), Mayan pyramid, to Temple of the Warriors and jungle in distance, Chichen Itza, UNESCO World Heritage Site, Yucatan, Mexico, Central America

Chapel inside Kronborg renaissance castle, UNESCO World Heritage Site, Helsingor, Denmark, Scandinavia, Europe

Huge old anchor in front of Kronborg renaissance castle, UNESCO World Heritage Site, Helsingor, Denmark, Scandinavia, Europe

Elevated view from the Old Town Bridge Tower over Prague Castle and the Mala Strana District, UNESCO World Heritage Site, Prague, Bohemia, Czech Republic

Castillo de la Real Fuerza (Castle of the Royal Force), La Habana Vieja, UNESCO World Heritage Site, Havana, La Habana Province, Cuba, West Indies, Caribbean, Central America

Castel del Monte, octagonal castle, built for Emperor Frederick II in the 1240s, UNESCO World Heritage Site, Apulia, Italy, Europe

Castel del Monte, octagonal castle, built for Emperor Frederick II in the 1240s, UNESCO World Heritage Site, Apulia, Italy, Europe

Fierce gargoyle above archway, Pena National Palace, UNESCO World Heritage Site, Sintra, Portugal, Europe

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

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

Harlech Castle, UNESCO World Heritage Site, Snowdonia National Park, Gwynedd, Wales, United Kingdom, Europe

Castle Mountain behind the Bow river at Castle Junction, Bow Valley Parkway, Banff National Park, UNESCO World Heritage Site, Alberta, Canadian Rockies, Canada, North America

Aerial image of Old Sarum, the original site of Salisbury with castle ruins and cathedral foundations inside two high Iron Age banks (earthworks), Wiltshire, England, United Kingdom, Europe

High angle view of the old town, UNESCO World Heritage Site, with Hohensalzburg Fortress, Dom Cathedral and Kappuzinerkirche Church at dusk, Salzburg, Salzburger Land, Austria, Europe

High angle view of the Old Town, UNESCO World Heritage Site, with Hohensalzburg Fortress, Dom Cathedral and Kappuzinerkirche Church, Salzburg, Salzburger Land, Austria, Europe

High angle view of the old town, UNESCO World Heritage Site, with Hohensalzburg Fortress, Dom Cathedral and Kappuzinerkirche Church at dusk, Salzburg, Salzburger Land, Austria, Europe

High angle view of the Old Town, UNESCO World Heritage Site, with Hohensalzburg Fortress, Dom Cathedral and Kappuzinerkirche Church, Salzburg, Salzburger Land, Austria, Europe

High angle view of the Old Town, UNESCO World Heritage Site, with Hohensalzburg Fortress and Dom Cathedral at dusk, Salzburg, Salzburger Land, Austria, Europe

High angle view of the Old Town, UNESCO World Heritage Site, with Hohensalzburg Fortress, Dom Cathedral and Kappuzinerkirche Church, Salzburg, Salzburger Land, Austria, Europe

High angle view of the Old Town, UNESCO World Heritage Site, with Hohensalzburg Fortress, Dom Cathedral and Kappuzinerkirche Church, Salzburg, Salzburger Land, Austria, Europe

High angle view of the Old Town, UNESCO World Heritage Site, with Hohensalzburg Fortress, Dom Cathedral and Kappuzinerkirche Church, Salzburg, Salzburger Land, Austria, Europe

Durham Castle, a motte and bailey structure, UNESCO World Heritage Site, Durham, England, United Kingdom, Europe

Baroque castle dating from the 12th century, with work by Italian architect Domenico Martinelli, Valtice, UNESCO World Heritage Site, South Moravia, Czech Republic, Europe

Royal chateau of Amboise lit at dusk on the banks of River Loire, Loire Valley, UNESCO World Heritage Site, Indre et Loire, Pays de la Loire, Centre, France, Europe

North west facade of Chateau de Chambord in the Loire Valley reflected in the River Cosson, UNESCO World Heritage Site, Loir et Cher, Pays de la Loire, Centre, France, Europe

Byzantine architecture of Holy Trinity church, Citadel of Berat Castle, UNESCO World Heritage Site, Berat, Albania, Europe

Aerial view of Beaumaris Castle, UNESCO World Heritage Site, Beaumaris, Isle of Anglesey, North Wales, United Kingdom, Europe

Snow-covered Prague Castle, Mala Strana and Vltava River, UNESCO World Heritage Site, Prague, Czech Republic, Europe

St. John of Nepomuk (Jan Nepomucky) shrine with cross at Charles Bridge with snow-covered Prague Castle and Mala Strana in background, UNESCO World Heritage Site, Prague, Czech Republic, Europe

Castillo de la Real Fuerza, Habana Vieja (Old Town), UNESCO World Heritage Site, Havana, Cuba, West Indies, Caribbean, Central America

View across Danube River of Chain Bridge and Buda Castle at night, UNESCO World Heritage Site, Budapest, Hungary, Europe

People hiking in Monk's Cowl Nature Reserve with Champagne Castle in background, Ukhahlamba-Drakensberg Park, UNESCO World Heritage Site, KwaZulu-Natal, South Africa, Africa

People hiking in Monk's Cowl Nature Reserve with Champagne Castle in background, Ukhahlamba-Drakensberg Park, UNESCO World Heritage Site, KwaZulu-Natal, South Africa, Africa

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

The Terminal Warehouse built in the early 1800s, Victoria Quays, originally Canal Wharfe, Castle Gate Quarter, Sheffield, Yorkshire, England

Foreboding evening skies above the immense Caernarfon Castle, UNESCO World Heritage Site, Caernarfon, Gwynedd, North Wales, Wales, United Kingdom, Europe

Schonbuhel Castle and the Danube Rive, Wachau Cultural Landscape, UNESCO World Heritage Site, Austria, Europe

Mirador de San Nicolas, Islamic and Mudejar architecture, Alhambra, UNESCO, Granada, Andalusia, Spain

Looking north from Milecastle 37 to Broomlee Lough, Hadrians Wall, UNESCO World Heritage Site, Northumbria National Park, Northumberland, England, United Kingdom, Europe

San Pedro de la Roca Castle, UNESCO World Heritage Site, Santiago de Cuba, Santiago de Cuba Province, Cuba, West Indies, Caribbean, Central America