居庸关，是北京长城沿线上的著名古关城，地势险要，且有"一夫当关万夫莫开"之势，一直是兵家必争之地。居庸关的得失昭示着王朝的兴衰成败，更成为改朝换代的象征。此外，居庸关一带的汉族与关外游牧民族在此交汇，融合成具有居庸关特色的民俗文化。它雄伟的关城及众多的历史遗迹，为我们打开了一扇了解中国古代军事文化的大门。
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