Feng shui
Doseongul (cave) is really just a passageway between gigantic cliff-boulders next to Sanshingak. It is said that Great Monk Wonhyo Daesa spent some time meditating in here, and that 200 years later National Master Doseon Guksa lived here for a short time while working on the theory of Korea's adaptation of Feng shui, Pungsu-jiri-seol.