Opened to the public in September 1992, the Unification Observatory is built on Ohdusan (Mt. Ohdu) and offers views of some of the area's most beautiful scenery, where the Han River meets the Imjin River flowing down from North Korea. Not your traditional "observatory" for looking at celestial beauties, this five-story building (four aboveground and one under) has an observation platform, from which you can see Geumgangsan (Diamond Mountain) in North Korea's Gaesong and as far as the 63 Building in Seoul. The North Korea and Unification Rooms offer displays of photographs, maps, and video of the history of the two Koreas.