1.安徽寿县古城墙:寿县古城墙是我国现存少数几座保存完好的古城墙之一,亦是我国现存惟一保存完整的宋代城墙。寿县城墙建于宋代熙宁年间(公元1068年至1077年),至今已有900多年的历史。城墙呈方形,周长7141米,有东、南、西、北四门。另在东北拐和西北拐各建有排水涵洞一个,这是 1. Shoushan Ancient City Wall: Shouxian Ancient City Wall is one of the few well-preserved ancient city walls in our country. It is also the only preserved city wall of Song Dynasty in our country. Shouxian wall was built in the Song Dynasty Xining years (AD 1068 to 1077), has been 900 years of history. The city wall is square, 7141 meters in circumference, with east, south, west and north four doors. Another in the northeast and Northwest Shuihuai built drainage culvert one, which is