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Fort St. Angelo, fishing boat and Vittoriosa (Birgu) at sunset, Grand Harbour, Valletta, Malta, Mediterranean, Europe

Hardknott Roman Fort interior looking west along the Eskdale Valley to the Solway Firth, South Lakes, Lake District National Park, Cumbria, England, United Kingdom, Europe

White sand beach and turquoise waters in front of Fort Jefferson, Dry Tortugas National Park, Florida Keys, Florida, United States of America, North America

Turquoise waters and white sand beach in front of Fort Jefferson, Dry Tortugas National Park, Florida Keys, Florida, United States of America, North America

Fort Jefferson, Dry Tortugas National Park, Florida Keys, Florida, United States of America, North America

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

Aerial image of Maiden Castle, an Iron Age hill fort, Winterborne Monkton, near Dorchester, Dorset, England, United Kingdom, Europe

Aerial image of Housesteads Roman Fort of Vercovicium, an auxiliary fort on Hadrian's Wall, UNESCO World Heritage Site, Northumberland, England, United Kingdom, Europe

Aerial image of Rybury Camp, an Iron Age hill fort with Neolithic causewayed enclosure, Wiltshire, England, United Kingdom, Europe

Aerial image of Maiden Castle, an Iron Age hill fort, Winterborne Monkton, near Dorchester, Dorset, England, United Kingdom, Europe

Aerial image of Battlesbury Camp, an Iron Age Hill fort, Warminster, Wiltshire, England, United Kingdom, Europe

Aerial image of Maiden Castle, an Iron Age hill fort, Winterborne Monkton, near Dorchester, Dorset, England, United Kingdom, Europe

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

Mandalay City Fort and Palace reflected in the moat surrrounding the compound at night, Mandalay, Myanmar (Burma), Asia

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

Flowers frame old mystical buildings of Romanesque Gothic and Renaissance style, Quinta da Regaleira, Sintra, Portugal, 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

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

Giant statue of Mubarek Ahmed Sharafaddin in front of the citadel of Erbil (Hawler), capital of Iraq Kurdistan, Iraq, Middle East

Hvar Town and tourists at Hvar Spanish Fort (Fortica) at sunset, Hvar Island, Dalmatian Coast, Adriatic, Croatia, Europe

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

Dubrovnik and the City Walls at sunrise, from Fort Lovrijenac (St. Lawrence Fortress), 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

Extensive remains of the bath site which included changing rooms, hot rooms and cold plunge pools, on the edge of what is now the River North Tyne, dating from AD138, Cilurnum (Chesters Roman Fort), Hadrian's Wall, UNESCO World Heritage Site, Chollerford, Northumbria National Park, 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

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