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中国万里长城除了是热门旅游景点，更是重点文物保护单位。不过，南口抗战纪念馆馆长杨国庆，近日发现北京昌平区一段明代长城疑遭人为破坏，“长城修缮后没几年，城墙便豁开了一个口子”。

破损处位于从高楼向北京方向数第3座敌楼附近。该处低矮的城墙被挖开长2米多，阔1米多的坑道，碎石顺坑道口向城墙外侧倾泻而下。从散落在地的石块上，可见有阿拉伯数字及指示箭头，疑似用喷漆所留。

该坑道两侧分别有两条崎岖的山路，一边通往北京，另一边可通向河北怀来。杨国庆推断，可能有人嫌长城挡路，所以才挖出坑道。他去年秋天经过时，城墙仍旧完好，估计坑道应该是去年年底或今年出现。

杨国庆表示，该段长城曾是1937年南口战役的战区，由于当年曾遭遇炮击，加上自然坍塌等因素，导致城墙破败不堪。文物部门于2012年时曾修缮该段长城，将破损的城墙重新筑固。

公开资料显示，昌平区遗存有北齐长城及明代长城，包括明代重建的居庸关，以及高楼附近的黄楼院长城等。该段长城有2468.6米长，共有单体建筑15座，敌台14座，墙体14段。其中，高楼海拔1439.3米，为昌平的最高点；长城内侧还有烽火台和一处遗址。