Fort of Baima Pass

Baimaguan is a dangerous terrain, since ancient times as a fortress, is the main passage to the northeast. Ming Jiajing 30 years (1551) to Longqing three years (1569) built the Great Wall Baimaguan Yi'ai, and built the Yingcheng 150 meters south, Mingshi Baimaguan Fort. The castle is located in Baimaguan Village. As a county-level cultural relics protection unit, its door cave and western wall are well preserved. According to the "Beijing Encyclopedia Miyun Scroll", Baimaguan belongs to Shitang Road, the castle sits north and south, 152 meters long, 50 meters wide, rectangular, and 7600 square meters. There is only one south gate, and the city gate cave is built with city bricks, and the inside is made of large mountain stones. The "Baima Guanbao" stone is clearly written, still embedded in the city gate cave, and there is a bonfire platform built on an isolated mountain south of the castle, which echoes the castle. In the Qing Dynasty, the adjustment was set up and the total guard was kept.

位于北京密云县的一处关隘，仅存东西两道残城墙顺山势上行，虽然残旧但依然雄伟，关内还留有残存的古堡。

白马关有边墙两道，当地百姓称之为“一道边”和“二道边”，墙都不长，遇山崖而止。现城堡已废，惟剩下了一个南门洞还有些模样，上有匾题“白马关堡“。