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Fort Union National Monument and Santa Fe National Historic Trail, New Mexico, United States of America, North America

Aerial image of Deal Castle, a Device fort (Henrician Castle) built by Hentry VIII, Deal, Kent, England, United Kingdom, Europe

Fortress and Palace of the Grand Masters, UNESCO World Heritage Site, Rhodes City, Rhodes, Dodecanese, Greek Islands, Greece, Europe

Fortress and the Palace of the Grand Masters, UNESCO World Heritage Site, Rhodes City, Rhodes, Dodecanese, Greek Islands, Greece, Europe

Brimstone Hill Fortress, UNESCO World Heritage Site, St. Kitts, St. Kitts and Nevis, Leeward Islands, West Indies, Caribbean, Central America

Ladies Tower, Partal Palace, Alhambra Palace, UNESCO World Heritage Site, Granada, Andalucia, Spain, Europe

People watching the Alhambra at the sunset from San Nicolas viewpoint, Granada, Andalucia, Spain, Europe

Caernarfon Castle, UNESCO World Heritage Site, and the Seiont Estuary at night, Caernarfon, Gwynedd, North Wales, United Kingdom, Europe

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

Walled and turreted fortress of La Cite, Carcassonne, UNESCO World Heritage Site, Languedoc, France, Europe

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

Fortress and Palace of the Grand Masters, UNESCO World Heritage Site, Rhodes City, Rhodes, Dodecanese, Greek Islands, Greece, Europe

Kamerlengo Fortress (Gradina Kamerlengo) at sunrise, Trogir, UNESCO World Heritage Site, Dalmatian Coast, Adriatic, Croatia, Europe

The Alhambra, Moorish Fortress Palace, UNESCO World Heritage Site, Granada, Andalusia, Spain, Europe

Segovia Castle and Gothic style Segovia Cathedral built in 1577, UNESCO World Heritage Site, Segovia, Madrid, Spain, Europe

Hili Fort and watchtower, Hili, Al Ain, UNESCO World Heritage Site, Abu Dhabi, United Arab Emirates, Middle East

Cannons, royal insignia, Brimstone Hill Fortress National Park, UNESCO World Heritage Site, St. Kitts and Nevis, Leeward Islands, West Indies, Caribbean, Central America

Palace of the Lions (Palacio de los Leones), The Alhambra, UNESCO World Heritage Site, Granada, Andalucia, Spain, Europe

Contemporary art museum in castle Sao Jose, Arrecife, Lanzarote, Canary Islands, Spain, Atlantic, Europe

View of Trautenfels Castle reflection in Schlossteich Fischstoberl fishing pond, Styria, Austria, Europe

The ancient fortified city of Carcassone, UNESCO World Heritage Site, Languedoc-Roussillon, France, Europe

Aerial image of the Tower of London, UNESCO World Heritage Site, London, England, United Kingdom, Europe

Tourists at Masada fortress ruins, air thick with desert sand, UNESCO World Heritage Site, Israel, Middle East