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Strong walls of Ichon-Qala (Itchan Kala) Fortress, UNESCO World Heritage Site, Khiva, Uzbekistan, Central Asia

Pikk Hermann (Tall Hermann) Tower at Toompea Castle, Toompea, Tallinn, Estonia, Baltic States, 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 Leeds Castle and moat, a medieval castle, southeast of Maidstone, Kent, 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

People enjoy an evening walk outside of the Red Fort (Lal Qila), built by Shah Jahan between 1638 and 1648, UNESCO World Heritage Site, Delhi, India, Asia

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

Aerial image of Piel Castle (Fouldry Castle) (Fouldrey Castle), a concentric medieval fortification with a keep and three towers, Piel Island, Furness Peninsula, Barrow in Furness, Cumbria, England, United Kingdom, Europe

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

Frederiksborg Slot Castle built in the 17th century for King Christian 4th on Castle Lake, Hillerod, Zealand, Denmark, Scandinavia, Europe

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

Carreg Cennen Castle at dawn on a misty summer morning, Brecon Beacons National Park, Carmarthenshire, Wales, United Kingdom, Europe

Old military fortress, Botany Bay National Park, La Perouse, Sydney, New South Wales, Australia, Pacific

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

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

Durham Castle, a motte and bailey structure, UNESCO World Heritage Site, Durham, England, United Kingdom, Europe

Catalan flag flies over the Montjuic Castle old military fortress on Montjuic Mountain overlooking the city, Barcelona, Catalonia, Spain, Europe

Man with his horse in the valley of Chehel Burj (Forty Towers fortress), Yaklawang province, Bamyan, Afghanistan, 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

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

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

Aerial view by drone of Rethymno old town, Venetian Harbour and fortress, Crete Island, Greek Islands, Greece, Europe

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

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

Snow capped High Atlas Mountains from Kasbah Ait Ben Haddou, near Ouarzazate, Morocco, North Africa, Africa

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