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NationMaster - Encyclopedia: Walled cities |
 | | Generally, these are referred to as city walls or town walls, although there were also walls, such as the Great Wall of China and the Atlantic Wall, which extended far beyond the borders of a city and were used to enclose vast regions. |
 | | City walls were still occasionally used as late as the 19th century, although by this time they were generally of wood (rather than stone) construction and used only around small frontier settlements. |
 | | The practice of building these massive walls, though having its origins in prehistory, was refined during the rise of city-states, and energetic wall-building continued into the medieval period and beyond in certain parts of Europe. |
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