燕墩

宝是5毫升塑料瓶，有磁性。Cache is 5 ml tube, magnetic.燕墩坐落在永定门外，根据文献记载，元朝、明朝北京有“五镇”的说法，其中南方之镇即燕墩。因为南方在五行中属火，所以堆烽火台以应之，即燕墩。燕墩是一座下宽上窄、平面呈正方形的墩台，台底各边长14.87米，台面边长13.9米，台底到台面高约9米。台顶四周原来有高约1米的女儿墙，现已毁。墩台西北角有两扇石门，进门之后可登上45级台阶到达台顶。台顶正中是一座正方形石坛，石坛上立有正方石碑一座，高约8米。碑座为束腰须弥座，碑身南、北两面分别镌刻清朝乾隆帝手书的满文和汉文《御制皇都篇》和《御制帝都篇》，碑顶为四角攒尖顶，四脊各有一龙。Yandun is located outside Yongding Gate. According to historical records, during the Yuan and Ming dynasties, Beijing was said to have five "towns," and the southern town was Yandun. Since the south is associated with the element of fire in the Five Elements theory, beacon towers were built there in response, thus the name Yandun.Yan Dun is a pedestal that is wide at the bottom and narrow at the top, with a square-shaped footprint. The side length of the base is 14.87 meters, while the side length of the top platform is 13.9 meters. The height from the base to the platform is approximately 9 meters. Originally, there was a parapet about 1 meter high around the top of the platform, but