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Entrance to Chateau Comtal in the walled and turreted fortress of La Cite, Carcassonne, UNESCO World Heritage Site, Languedoc, France, Europe

The White Tower, Tower of London, UNESCO World Heritage Site, London, England, United Kingdom, Europe

Thomas Telford's Conwy Suspension Bridge and Conwy Castle, UNESCO World Heritage Site, at night, Conwy, North Wales, United Kingdom, Europe

The ruins of the Parthian fortress, Nissa, UNESCO World Heritage Site, Turkmenistan, Central Asia, Asia

The medieval walls and fortress in the old town of Otranto, Province of Lecce, Apulia, Italy, Europe

View from Santa Chiara Basilica to Rocca Maggiore Fortress, Assisi, Perugia District, Umbria, Italy, Europe

Typical Dodecanese white houses and the Acropolis above Lindos, Rhodes, Dodecanese Islands, Greek Islands, Greece, Europe

Qalaat Ibn Maan, 17th century Arab Castle overlooking the Graeco-Roman city, Palmyra, Syria, Middle East

The round Norman Keep (Round Tower) in Windsor Castle with the Queen's flag (Royal Standard) flying, Windsor, Berkshire, England, United Kingdom, Europe

Walls of the citadel, historic former political capital, Hue, central Vietnam, Indochina, Southeast Asia, Asia

People on the Badaling section, the Great Wall of China, UNESCO World Heritage Site, near Beijing, China, Asia

Jinshanling section of the Great Wall of China, UNESCO World Heritage Site, near Beijing, China, Asia

Romantic sunrise over the ancient fortress or Kasbah Amridil, Skoura, Atlas mountains, Ouarzazate province, Morocco, North Africa, Africa

City walls and the Kamerlengo fortress, Trogir, UNESCO World Heritage Site, Dalmatia, Dalmatian Coast, Croatia, Europe

Kiz-Kala fortress, dating from the 6th century AD, Old Merv, UNESCO World Heritage Site, Turkmenia, Turkmenistan, Central Asia, Asia

Kasbah Ait Benhaddou, an ancient fortified village (Ksar) on the old caravan route between The Sahara Desert and Marrakech, UNESCO World Heritage Site, Morocco, North Africa, Africa

Traditional kasbahs (fortified houses) bathed in evening light in the town of Nkob, near the Jbel Sarhro mountains, Morocco, North Africa, Africa

Harbour and fortress, Cabrera Island, Cabrera National Park, Balearic Islands, Spain, Mediterranean, Europe