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Moti Masjid (1646-53), Pearl Mosque built by Shah Jehan (Jahan) in the Red Fort, Agra, Uttar Pradesh, India

Crac des Chevaliers, Crusader castle, 1150-1250, built by the Knights Hospitaller, Syria, Middle East

The whitewashed city wall, including a defensive tower, in the white city (Citta Bianca), Ostuni, Apulia, Italy, Europe

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

Pikk Hermann (Tall Hermann) Tower at Toompea Castle, Toompea, Tallinn, Estonia, Baltic States, 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

Fortress medina and Borj Dar El Baroud Tower at Port of Tangier, Tangier, Morocco, North Africa, Africa

Top view of the spiral stairs inside the towers of masonic Initiation Well at Quinta da Regaleira, Sintra, Portugal, Europe

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

Obidos castle, a medieval forstress, today used as a luxury Pousada hotel, in Obidos, Estremadura, Portugal, Europe

Obidos castle, today used as a luxury Pousada hotel, partially illuminated at night, Obidos, Estremadura, Portugal, Europe

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

Castillo de la Real Fuerza, Old Town, UNESCO World Heritage Site, Havana, Cuba, West Indies, Caribbean, Central America

Rumeli Hisari (Fortress of Europe) and Fatih Sultan Mehmet Suspension Bridge, Hisarustu, Bosphorus Strait, Istanbul, Turkey, Europe

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

Caernarfon Castle, Medieval Fortress, UNESCO World Heritage Site, Gwynedd, Wales, United Kingdom, Europe

View to Our Lady before Tyn Church, the Old Town Hall Clock Tower and Prague Castle, UNESCO World Heritage Site, Prague, Bohemia, Czech Republic, Europe

View to Our Lady before Tyn Church and Prague Castle at dusk, UNESCO World Heritage Site, Prague, Bohemia, Czech Republic, Europe

Castle of the Teutonic Order in Malbork, UNESCO World Heritage Site, Pomeranian Voivodeship, Poland, Europe

Bamburgh Castle and Bamburgh Castle walls from Bamburgh Village, Northumberland, England, United Kingdom, Europe

The 16th century Belem Tower (Torre de Belem), designed by Francisco Arruda, by the Tejo River (Tagus River), Lisbon, Portugal, Europe

Old Town Barbican defensive bastion built in 1498, Krakow (Cracow), UNESCO World Heritage Site, Poland, Europe

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

Castell de Bellver, a 14th century castle, Palma de Mallorca, Mallorca (Majorca), Balearic Islands, Spain, Mediterranean, Europe

Torre (Tower) di Ligny, built 1671 as fort, now a Prehistory Museum, on seafront of this northwest fishing port, Trapani, Sicily, Italy, Mediterranean, Europe

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

View of Alhambra Palace complex from Generallife, UNESCO World Heritage Site, Granada, Andalucia, Spain, Europe

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

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

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

Rumeli Hisari (Fortress of Europe or Rumelihisari), elevated view from the Bosphorus Strait, Hisarustu, Istanbul, Turkey, Europe

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

Wawel Castle, UNESCO World Heritage Site, reflected in the Vistula River, at sunrise, Krakow, Poland, Europe

Boats moored near Caernarfon Castle, UNESCO World Heritage Site, Gwynedd, Wales, United Kingdom, Europe