Jian Kou Great Wall built in Ming dynasty. about 1000 meters above sea level.
箭扣长城明初建关，海拔1000余米，以雄伟险峻而著称。
The eastern part of Jian Kou Great Wall-North Building is well preserved at here.
箭扣长城往东是这里保存量完好的城楼——正北楼，它是慕田峪长城的至高点。
The eastern part of Jian Kou Great Wall-North Building is well preserved at here.
箭扣长城往东是这里保存量完好的城楼——正北楼，它是慕田峪长城的至高点。
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