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La Chaine and St. Nicholas towers at the entrance to the ancient port of La Rochelle at dusk, Charente-Maritime, France, Europe

The Fort of Nossa Senhora da Penha de Franca, popularly known as the Fortaleza Ponta da Bandeira, built towards the end of the 17th century to defend the harbour, Lagos, Algarve, Portugal, Europe

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

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

The interior of Cathedral of SS Peter and Paul in the Peter and Paul Fortress. St. Petersburg, Russia, 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

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

Fort Beekenburg, Caracas Bay, Curacao, Netherlands Antilles, West Indies, Caribbean, Central America

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

View of a section of the Great Wall, UNESCO World Heritage Site, between Jinshanling and Simatai near Beijing, China, Asia

View of a section of the Great Wall, UNESCO World Heritage Site, between Jinshanling and Simatai near Beijing, China, Asia

Great Wall of China, UNESCO World Heritage Site, and the Yellow River in the Tengger desert at Shapotou near Zhongwei, Ningxia Province, China, Asia

Great Wall of China, UNESCO World Heritage Site, and the Yellow River in the Tengger desert at Shapotou near Zhongwei, Ningxia Province, China, Asia

Castillo de Jagua (Jagua Fortress), Cienfuegos, Cienfuegos Province, Cuba, West Indies, Caribbean, Central America

Snow covered Old Town with towers of Glockenspiel, Dom and Franziskanerkirche churches dominated by the fortress of Festung Hohensalzburg at twilight, Salzburg, Austria, Europe

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

Garden outside Lower Town Wall with Oleviste Church in background, Tallinn, Estonia, Baltic States, Europe

Garden outside Lower Town Wall with Oleviste Church in background, Tallinn, Estonia, Baltic States, Europe

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

A tree stands outside the walls of the ruined Tughluqabad Fortress, constructed under Ghiyas-ud-Din in 1321 AD and abandoned in 1327 AD, in Delhi, India, Asia

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

Mosaic floor, Byzantine Church, hill top palace complex, Masada fortress, UNESCO World Heritage Site, Israel, Middle East

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

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

Mount Orgueil Castle, illuminated at dusk, 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

Royal Bathing Pool at the top of 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

The walls and moat of the Fortress in the former Portuguese colony of Diu, Union Territory of Diu and Daman, India, Asia

An Indian woman in a sari walks through the gate leading to the Fortress in Diu, Union Territory of Diu and Daman, India, Asia

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

Montjuic Castle old military fortress on Montjuic Mountain overlooking the city, Barcelona, Catalonia, Spain, Europe

Montjuic Castle old military fortress on Montjuic Mountain overlooking the city, Barcelona, Catalonia, Spain, Europe

Views of the city from Montjuic Castle old military fortress on Montjuic Mountain overlooking the city, Barcelona, Catalonia, Spain, Europe

Views of cruise ships in Port of Barcelona from the Montjuic Castle old military fortress on Montjuic Mountain overlooking the city, Barcelona, Catalonia, Spain, Europe

Views of cruise ships in Port of Barcelona from the Montjuic Castle old military fortress on Montjuic Mountain overlooking the city, Barcelona, Catalonia, Spain, Europe

Views of Port of Barcelona from the Montjuic Castle old military fortress on Montjuic Mountain overlooking the city, Barcelona, Catalonia, Spain, Europe

Views of Port of Barcelona from the Montjuic Castle old military fortress on Montjuic Mountain overlooking the city, Barcelona, Catalonia, Spain, Europe