World War II Memorial of the Japanese Army is 2 kilometres from the park office. It is a historical attraction. During World War II, the Japanese soldiers occupied the area of Khao Daeng as a military base and prison for captives. There remain traces of holes caused by the bombs left behind by the Japanese soldiers. The constructions made by the Japanese soldiers are the commanding tunnel, trenches along the valley, the commanding room, a treasure room, and the bunker lines.