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

A storm passes behind Bamburgh Castle with the last light of the day illuminating the rocky shoreline and castle, Northumberland, England, United Kingdom, Europe

Top view of the spiral stairs inside the towers of masonic Initiation Well at Quinta da Regaleira, Sintra, Portugal, Europe

Looking across Embleton Bay at sunrise towards the silhouetted ruins of Dunstanburgh Castle in the distance and the vivid colours in the sky reflecting in the sea and wet sand, Embleton, near Alnwick, Northumberland, England, United Kingdom

The Kings Tower at Knaresborough Castle in the snow Knaresborough, Yorkshire, England, United Kingdom, Europe

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

View over Cochem Castle and the Mosel River Valley in autumn, Cochem, Rheinland-Pfalz (Rhineland-Palatinate), Germany, Europe

Cochem Castle and the Mosel River in winter, Cochem, Rheinland-Pfalz (Rhineland-Palatinate), Germany, Europe

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

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

Rumeli Hisari (Fortress of Europe) and Fatih Sultan Mehmet Suspension Bridge, Hisarustu, Bosphorus Strait, Istanbul, Turkey, Europe

The gate of Castello Svevi, the 13th century castle built for King Frederick II, the Holy Roman Emperor, in Trani, Apulia, Italy, Europe

Burg Kreuzenstein castle, Leobendorf, Weinviertel Region, Lower Austria, near Vienna, Austria, Europe

Edinburgh Castle, historic fortress, UNESCO World Heritage Site, Castle Rock, Castlehill, Edinburgh Old Town, Midlothian, Scotland, United Kingdom, Europe

Edinburgh Castle, historic fortress, Castle Rock, Castlehill, Edinburgh Old Town, UNESCO World Heritage Site, Midlothian, Scotland, United Kingdom, Europe

Forti de Sant Jordi built in 1709 by the English army under War of Succession, Tarragona, Catalonia, Spain, Europe

Moonlit Bamburgh Castle reflected in still water at dusk, Bamburgh, Northumberland, England, United Kingdom, Europe

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

View to Our Lady before Tyn Church, the Old Town Hall Clock Tower and Prague Castle, UNESCO World Heritage Site, Prague, Bohemia, Czech Republic, Europe

View to Our Lady before Tyn Church and Prague Castle at dusk, UNESCO World Heritage Site, Prague, Bohemia, Czech Republic, Europe

Panoramic view over Vltava River, Charles Bridge, the Mala Strana District and Prague Castle, UNESCO World Heritage Site, Prague, Bohemia, Czech Republic, Europe

View from the banks of Vltava River over the Mala Strana district, Prague Castle and St. Vitus Cathedral, UNESCO World Heritage Site, Prague, Czech Republic, Europe

Blair Castle, ancestral home of Clan Murray, Blair Atholl, Perthshire, Scotland, United Kingdom, Europe

View from the banks of Vltava River over the Mala Strana district and Prague Castle, UNESCO World Heritage Site, Prague, Bohemia, Czech Republic, Europe

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

Sunlit Venetian Bourtzi Fortress, island, Nafplio (Nafplion), near Argos, Argolic Gulf, eastern Peloponnese, Greece, Europe