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| Description: Early cities were small economic centers surrounded by walls to keep out enemies. These cities had to be fortresses, for they were constantly under threat. This photo is of Ávila, Spain, whose walls date from 1090. Picture Stats: Views: 355 Filesize: 2.82MB Height: 927 Width: 1390 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=28000 |