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Wikipedia: A defensive wall is a fortification used to defend a city or settlement from potential aggressors. In ancient to modern times, they were used to enclose settlements. Generally, these are referred to as city walls or town walls, although there were also walls, such as the Great Wall of China, Hadrian's Wall, and the metaphorical Atlantic Wall, which extended far beyond the borders of a city and were used to enclose regions or mark territorial boundaries.
![[A model the fortifications built around London during the English Civil War viewed from the east]](http://images.ookaboo.com/photo/s/Lines_of_Communication_28London_29_s.jpg "A model the fortifications built around London during the English Civil War viewed from the east")
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![[Part of the Wall in San Francisco de Campeche, a UNESCO World Heritage Site]](http://images.ookaboo.com/photo/s/NDSAJDF18_s.jpg "Part of the Wall in San Francisco de Campeche, a UNESCO World Heritage Site")
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 from Philip_Baird_Shearer |
 from HAKEBRY1 |
![[Part of the Great Wall of China, a UNESCO World Heritage Site]](http://images.ookaboo.com/photo/s/20090529_Great_Wall_8125_s.jpg "Part of the Great Wall of China, a UNESCO World Heritage Site")
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![[9th cent. BC relief of an Assyrian attack on a walled town]](http://images.ookaboo.com/photo/s/Assyrian_Attack_on_a_Town_s.jpg "9th cent. BC relief of an Assyrian attack on a walled town")
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from Jakubhal |
from Capillon |
![[Defensive wall in Stargard Szczeciński, Poland]](http://images.ookaboo.com/photo/s/Stargard_Mury_4_s.jpg "Defensive wall in Stargard Szczeciński, Poland")
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![[Defensive wall, Taroudant, Morocco]](http://images.ookaboo.com/photo/s/Defensive_wall_s.jpg "Defensive wall, Taroudant, Morocco")
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 from Politykstargard |
from Jongleur100 |
![[Walls of Dubrovnik, Croatia.]](http://images.ookaboo.com/photo/s/Walls_of_Dubrovnik_3_s.jpg "Walls of Dubrovnik, Croatia.")
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from Beyond silence |
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