The fortress on Munsusan Mountain (문수산, 376m) was built in 1694, the 20th year of the reign of King Sukjong, the 19th king of the Joseon Dynasty, to defend Gwanghwado, particularly from marine invasion. The fortress walls span 6km in length, 4km of which remain un-restored. Surrounded by beautiful scenery, the top of the fortress commands a spectacular view spanning from North Korea to the Hangang River inlet, and from Samgaksan Mountain to the sea off Incheon in the distance. It can be called Geumgangsan Mountain in Gimpo as it boasts superb scenery throughout all four seasons. (For all Koreans, Geumgangsan Mountain in North Korea symbolizes a ‘beautiful mountain’)