四十岁以上的北京人对北京的城墙和城根下的护城河还都有印象。许多人都有爬城墙头逮蛐蛐、放风筝、下护城河游泳的记忆。解放前的地图不说,就是20世纪50年代的北京地图上也可以清楚地看出,在老北京凸字形的城墙外,有一条循着城墙蜿蜒的护城河。现如今,城墙拆 Beijingers over the age of 40 are also impressed with the city walls in Beijing and the moat under the city walls. Many people have climbed the city wall to catch 蛐 蛐, fly a kite, swim under the moat memory. Before the liberation of the map does not say, is the 1950s Beijing map can also clearly see that in the old Beijing convex wall, there is a winding city walls along the moat. Now, the city wall demolition