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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

Fresh Spring snow at dawn highlight ripples and marks in the sand beneath Bamburgh Castle, Bamburgh, Northumberland, England

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

Cannon in historic castle in medieval village of Marvao, Portalegre district, Alto Alentejo, Portugal, Europe

Church of Surb Astvatsatsin (Vahramashen Church) at Amberd fortress located on the slopes of Mount Aragats, Yerevan, Aragatsotn, Armenia, Central Asia, Asia

Church of Surb Astvatsatsin (Vahramashen Church) at Amberd fortress located on the slopes of Mount Aragats, Yerevan, Aragatsotn, Armenia, Central Asia, Asia

Church of Surb Astvatsatsin (Vahramashen Church) at Amberd fortress located on the slopes of Mount Aragats, Yerevan, Aragatsotn, Armenia, Central Asia, Asia

Amberd fortress located on the slopes of Mount Aragats, with Mount Ararat in the distance, Yerevan, Aragatsotn, Armenia, Central Asia, Asia

Amberd fortress located on the slopes of Mount Aragats, with Mount Ararat in the distance, Yerevan, Aragatsotn, Armenia, Central Asia, Asia

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

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

Aerial image of Carisbrooke Castle, a historic motte-and-bailey castle, Carisbrooke, near Newport, Isle of Wight, England, United Kingdom, Europe

Aerial image of Windsor Castle, the largest inhabited castle in the world, Windsor, Berkshire, England, United Kingdom, Europe

Aerial image of Herstmonceux Castle, a brick-built Tudor castle near Herstmonceux, East Sussex, England, United Kingdom, Europe

Aerial image of Bamburgh Castle, a Norman castle built on a basalt outcrop on the coast, Bamburgh, Northumberland, England, United Kingdom, Europe

Aerial image of Corfe Castle, Purbeck Hills, between Wareham and Swanage, Dorset, 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 Maiden Castle, an Iron Age hill fort, Winterborne Monkton, near Dorchester, Dorset, England, United Kingdom, Europe

Mount Orgueil Castle, overlooking Grouville Bay in Gorey, Jersey, Channel Islands, United Kingdom, Europe

Water Gardens in the Royal Gardens at Sigiriya Rock Fortress (Lion Rock), UNESCO World Heritage Site, Sigiriya, Sri Lanka, Asia

Tourist at Sigiriya Rock Fortress (Lion Rock), UNESCO World Heritage Site, Sigiriya, Cultural Triangle, Sri Lanka, 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

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

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

Intricate stonework, Columbarium tower (dovecote), fortress ruins, Masada, UNESCO World Heritage Site, Israel, Middle East

Roman military camp ruins and the Judaean desert, seen from the Masada fortress, UNESCO World Heritage Site, Israel, Middle East

Monument to Overseas Combatants, of the Colonial Wars, Fortress of Good Success (Forte do Bom Sucesso), Belem, Lisbon, Portugal, Europe

Monument to Overseas Combatants, of the Colonial Wars, Fortress of Good Success (Forte do Bom Sucesso), Belem, Lisbon, Portugal, Europe

The Tower of Belem (Torre de Belem), the 16th century Manueline fortress, UNESCO World Heritage Site, on the River Tagus (Rio Tejo), Belem, Lisbon, Portugal, Europe

View over the beautiful mountains around the Citadelle Laferriere, UNESCO World Heritage Site, Cap Haitien, Haiti, Caribbean, Central America

Old cannons in front of the Citadelle Laferriere, UNESCO World Heritage Site, Cap Haitien, Haiti, Caribbean, Central America

Cityscape view over city centre high density buildings with cathedral church in centre, Malaga, Andalusia, Spain, 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

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

Bourtzi octagonal tower of Methoni Castle and the stone bridge in stormy sea, Methoni, Messenia, Peloponnese, Greece, Europe

Old town and St. Nicholas church on top of Narikala Fortress, Tbilisi, Georgia, Caucasus, Central Asia, Asia

Selcuk Byzantine castle stands on the hill of Ayasuluk, Selcuk, Anatolia, Turkey, Asia Minor, Eurasia

Cannons and green hills, Brimstone Hill Fortress, UNESCO World Heritage Site, St. Kitts, St. Kitts and Nevis, West Indies, Caribbean, Central America

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

Elevated view over Korcula's picturesque Stari Grad (Old Town) illuminated at dusk, Korcula Town, Korcula, Dalmatia, Croatia, Europe