Omija Theme Tunnel is located under Gomosanseong Fortress in Jinnamgyoban, Mungyeong. The Seokhyeon Tunnel, used to transport coal between Jeomchon and Mungyeong, was reborn as a 540-meter-long tunnel for tourism. In addition to cultural spots like the Starlight Tunnel and amazing trick arts, there are also craft shops where visitors can buy Omija, Mungyeong's specialty, and pottery. It is warm in winter and cool in summer because the average temperature is maintained at 15 to 18 degrees throughout the year.