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Waves wash over the beach next to Bamburgh Castle on a stormy winter evening, Northumberland, England, United Kingdom, Europe

Medieval stone tower on a grassy hill with clear blue sky, flanked by church spires in the background, Clifford's Tower, York, North Yorkshire, England, United Kingdom, Europe

The city wall of Mehrangarh Fort towering over the blue rooftops in Jodhpur, the Blue City, Rajasthan, India, Asia

Fortress of Frederick II of Swabia, Castel del Monte, Andria, Western Murge, Barletta, Apulia, Italy, Europe

Fortress of Frederick II of Swabia, Castel del Monte, Andria, Western Murge, Barletta, Apulia, Italy, Europe

Fortress of Frederick II of Swabia, Castel del Monte, Andria, Western Murge, Barletta, Apulia, Italy, Europe

Fortified Ibiza Old Town (Dalt Vila), UNESCO World Heritage Site, Ibiza, Balearic Islands, Spain, 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

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

Long exposure to record motion in the sea as it washes around black basalt boulders on a beach at Embleton Bay with the silhouette of Dunstanburgh Castle in the distance, Embleton Bay, near Alnwick, Northumberland, England, United Kingdom, Europe

Trogir's historic Stari Grad (Old Town) defensive walls and harbour, Trogir, Dalmatia, Croatia, 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

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

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

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

Gothic St. Vitus Cathedral, Prague Castle, Hradcany, Vitava River, Prague, Bohemia, Czech Republic, Europe

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

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

Sunrise on Hadrian's Wall National Trail in winter, looking to Housesteads Fort, Hadrian's Wall, UNESCO World Heritage Site, Northumberland, England, United Kingdom, Europe

Sunrise and Hadrian's Wall National Trail in winter, looking to Housesteads Fort, Hadrian's Wall, UNESCO World Heritage Site, Northumberland, England, United Kingdom, 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

Historic walled defences to Moorish citadel fortress palace of the Alcazaba, Malaga, Andalusia, Spain, Europe

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

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

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

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

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