Gwongeumseong Fortress is the site of a castle ruins called Mt. Seoraksan, and it is also known as Mt. Onggeumsan Castle, or Toto Castle. It is located on the steep Dol Mountain of Mt. Seoraksan Sogongwon area. It is believed to have been built by the 23rd King of the Goryeo Period (918~1392), Gojong (1213~1259 reign). It is also called Gwon-Kim Castle, as there is a legend that two generals named Gwon and Kim, built the castle to avoid war.At the left side of Sogongwon, past the Biryonggyo Bridge over the ravine, there is a path which leads to Gwongeumseong Castle, but it takes over an hour of travel through a steep, rocky path (2.5km), so cable cars are used. The cable car was installed by Dr. Gi-Sup Lee in 1971 and is still used by many tourists. It is operated from 7 a.m. to 6 or 6:30 p.m., departs every 7 minutes, and you can only purchase round-trip tickets at the ticket counter for that day. At the plateau of Gwongeumseong Castle there are 80 sections of rocks and you can see the East Sea and city of Sokcho. Also, to the west, you can see all kinds of fantastic rocks and stones which make up the Seoraksan Mountains.