@slowwalker, Behind the Acha mountain much longest historical story about general Ondal. He was great leader because he defending Goguryeo. After read your description I think Acha mountain brilliant place for watch Seoul's scenery. If we can see beautiful night view from Mt.Acha, that would be marvelous visual to us. After the see vehicle parking area, I believe more visitors come to this temple every single day more. The pillar wooden was big tree. Anyone can agree with me.