The Chamissongdan Altar is located on the north side of the summit of Mount Manesan in Incheon, where the founder of Korea Dangun is said to have made sacrifices to heaven. The story goes that he made sacrifices more than 4,000 years ago, making this landmark a historical treasure. The altar is surrounded by a beautiful nature of trees, and because it is located on the top of a mountain, the view from it is very beautiful.