长城词典·刘家口刘家口位于卢龙县西北，是秦皇岛境内的最后一个关口。由于一条河从关中流过，因此关楼便建成高大的过水楼。该楼高12米，长10米，宽9米，硕大，高耸，巍峨，可容百人戍守。楼内有一块镶嵌在墙上的石碑，记载万历六年重建刘家口关的情况。建文元年（1399年），燕王朱棣征讨宁王朱权，兵出刘家口，活捉宁王，4年后即废建文帝，自立为帝即永乐皇帝。 Great Wall dictionary·Liujia KouLiujia Kou，located in the northwest of Lulong County，is the last strategic pass in Qinhuang Dao. This pass is 12 meters high，10 meters long and 9 meters wide with a river running through. Inside the tower stands a stele on which the reconstruction of Liujia Kou pass is recorded.
