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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
Painting of Red Fort, 19th century, Archaeological Museum, Red Fort, Delhi, India, Asia
Corfe Castle at night, Corfe, Dorset, 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
Huge stone walls the fortress of Suwon, UNESCO World Heritage Site, South Korea, Asia
Huge stone walls around the fortress of Suwon, UNESCO World Heritage Site, South Korea, Asia
Huge stone walls around the fortress of Suwon, UNESCO World Heritage Site, South Korea, Asia
Fresh Spring snow at dawn highlight ripples and marks in the sand beneath Bamburgh Castle, Bamburgh, Northumberland, England
Victor Column, Kalemegdan Fortress, Belgrade, Serbia, Europe
Pennard Castle, overlooking Three Cliffs Bay, Gower, Wales, United Kingdom, Europe
Pennard Castle, overlooking Three Cliffs Bay, Gower, Wales, United Kingdom, Europe
Cardiff Castle, Bute Park, Cardiff, Wales, United Kingdom, Europe
Eilean Donan castle and the waters of Loch Duich, Highlands, Scotland, United Kingdom, 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
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
Norman Keep, Cardiff Castle, Cardiff, Wales, United Kingdom, Europe
Norman Keep, Cardiff Castle, Cardiff, Wales, United Kingdom, Europe
Norman Keep, Cardiff Castle, Cardiff, Wales, 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 Dover Castle over the white Cliff of Dover, Kent, 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
Sigiriya Rock Fortress, UNESCO World Heritage Site, seen from Pidurangala Rock, Sri Lanka, Asia
Dunnottar Castle outside of Stonehaven, Aberdeenshire, Scotland, United Kingdom, Europe
The Mehrangarh Fort of Jodhpur, Rajasthan, India, Asia
Interior courtyard, Palanok Castle, Mukachevo, Transcarpathia, Ukraine, 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
Tsarevets Fortress, Veliko Tarnovo, Bulgaria, Europe
Caerphilly Castle, Cardiff, Wales, United Kingdom, Europe
Ait-Benhaddou Kasbah, Morocco, North Africa
Pennard Castle, overlooking Three Cliffs Bay, Gower, Wales, United Kingdom, Europe
Pennard Castle, overlooking Three Cliffs Bay, Gower, Wales, United Kingdom, Europe
Fortified Ibiza Old Town (Dalt Vila), UNESCO World Heritage Site, Ibiza, Balearic Islands, Spain, Europe
Al Murabbaa Heritage Fort, Al Ain, Abu Dhabi, United Arab Emirates, Middle East
Al Murabbaa Heritage Fort, Al Ain, Abu Dhabi, United Arab Emirates, Middle East
Al Jahili Fort at dusk, Al Jahili Park, Al Ain, Abu Dhabi, United Arab Emirates, Middle East
Entrance to Al Murabbaa Heritage Fort, Al Ain, Abu Dhabi, United Arab Emirates, Middle East
Al Murabbaa Heritage Fort, Al Ain, Abu Dhabi, United Arab Emirates, Middle East
Al Jahili Fort, Al Jahili Park, Al Ain, Abu Dhabi, United Arab Emirates, Middle East
Sultan Bin Zayed Fort, now the Al-Ain Museum, Al Ain, Abu Dhabi, United Arab Emirates, Middle East
Al Jahili Fort, Al Jahili Park, Al Ain, Abu Dhabi, United Arab Emirates, Middle East
Chateau de Peyrepertuse, a Cathar castle, Languedoc, France, Europe
City of London skyscrapers viewed across the River Thames, London, England, United Kingdom, Europe
St. Rules Tower at St. Andrews Cathedral, Fife, Scotland, United Kingdom, Europe
St. Rules Tower at St. Andrews Cathedral, Fife, Scotland, United Kingdom, Europe
St. Andrews Castle, Fife, Scotland, United Kingdom, Europe
St. Andrews Castle, Fife, Scotland, United Kingdom, Europe
Trogir's historic Stari Grad (Old Town) defensive walls and harbour, Trogir, Dalmatia, Croatia, Europe
Bamburgh Castle and beach, Northumberland, England, United Kingdom, Europe
Kidwelly Castle, Carmarthenshire, Wales, United Kingdom, Europe
Kidwelly Castle, Carmarthenshire, Wales, United Kingdom, 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
Aberystwyth Castle, Ceredigion, West Wales, United Kingdom, Europe
Aberystwyth Castle, Ceredigion, West Wales, United Kingdom, Europe
St. Mawes Castle and coastline, St. Mawes, Cornwall, England, United Kingdom, Europe
La Calahorra, Granada, Andalusia, Spain
Bolsover Castle and corn field at sunset, Bolsover, Derbyshire, England, United Kingdom, Europe
Norman-Swabian Castle, Barletta, Barletta-Andria-Trani, Apulia, Italy
Norman-Swabian Castle, Barletta, Barletta-Andria-Trani, Apulia, Italy
Castle of Charles V, Monopoli, Bari, Apulia, Italy
Castle of Charles V, Monopoli, Bari, Apulia, Italy
De Monti Castle (Castello de Monti), Corigliano d'Otranto, Lecce, Salento, Apulia, Italy
De Monti Castle (Castello de Monti), Corigliano d'Otranto, Lecce, Salento, Apulia, Italy
De Monti Castle (Castello de Monti), Corigliano d'Otranto, Lecce, Salento, Apulia, Italy
De Monti Castle (Castello de Monti), Corigliano d'Otranto, Lecce, Salento, Apulia, Italy
De Monti Castle (Castello de Monti), Corigliano d'Otranto, Lecce, Salento, Apulia, Italy
Citadelle Laferriere, UNESCO World Heritage Site, Cap Haitien, Haiti, Caribbean, Central America
View of rocks and Mirow Castle ruins illuminated at night, Polish Jura, Poland, Europe
San Pedro de la Roca Castle, UNESCO World Heritage Site, Santiago de Cuba, Santiago de Cuba Province, Cuba, West Indies, Caribbean, Central America
New Year's Eve firework display at Wawel Castle, UNESCO World Heritage Site, Krakow, Poland, Europe
Old town and St. Nicholas church on top of Narikala Fortress, Tbilisi, Georgia, Caucasus, Central Asia, Asia
Gori Castle and Lomtchabuki statue, Gori, Shida Kartli, Georgia, Caucasus, Central Asia, Asia
Lion Rock Fortress, UNESCO World Heritage Site, Sigiriya, Sri Lanka, Asia
Bebris Tsikhe castle, Mtskheta, historical capital Georgia, Caucasus, Central Asia, Asia
Selcuk Byzantine castle stands on the hill of Ayasuluk, Selcuk, Anatolia, Turkey, Asia Minor, Eurasia
The 16th and 17th century fort and monastery at Basgo, Ladakh, Himalayas, India, Asia
The 16th and 17th century fort and monastery at Basgo, Ladakh, Himalayas, India, Asia
The 16th and 17th century fort and monastery at Basgo, Ladakh, Himalayas, India, Asia