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Doseongul Cave (used from 16th century onward)

Doseongul is a tiny cave that serves as a natural fortress high in the hills of Gumosan National Park. First used by a monk named Doseon (of whom little is known), the cave later sheltered the famous Goryeo (Koryö) loyalist Gil Jae (Kil Chae), who was revered by many in the Joseon (Chosön) dynasty for his fidelity to the last Goryeo King. The cave was later used by refugees fleeing the Japanese in the Imjin war of 1592-98. Though not truly "architecture", the cave has sheltered many fleeing trouble.

To reach the cave, visitors climb along a steep path edged with an iron railing.