The cache is located between Zhengguantai (No. 4 Watchtower ) and No. 3 Watchtower, just before a challenging flight of steps.
Cache位于正关台（四号敌楼）与3号敌楼间，前面是一段充满挑战性的阶梯。
Zhengguantai is one of the most representative watchtowers on the eastern side of the Mutianyu Great Wall. Also known as Mutianyu Pass, it consists of three watchtowers standing side by side. The pass was built in the 2nd year of the Yongle reign of the Ming Dynasty (1404) and held great strategic importance: one direction faced the northern tribes, one led directly toward Beijing, and another served as a shortcut to the imperial mausoleums.
The pass measures 40 meters long, 30 meters wide, and 20 meters high, with two levels. The lower level is interconnected, containing multiple rooms that were historically used for storing grain and stationing troops. From the battlements, you can enjoy an expansive view of the Great Wall stretching both inside and outside the pass.
正关台是慕田峪长城东侧最有代表性的敌楼之一。正关台是慕田峪关的别称，由三座敌楼并立。该关建于明永乐二年（1404年），战略地位重要，一边是塞外匈奴驻地，一边是入京通道，一边又是进入皇陵的捷径。
慕田峪关长40米，宽30米，高20米，为上下两层，底层相通，有室多间，可用于囤粮、屯兵。从垛口望长城内外，视野开阔。
