Janggoksa Temple, located at the foot of Chilgapsan Mountain, was constructed by State Preceptor Bojo toward the end of the Silla Dynasty. The temple underwent successive repair works in 1777 (the first year of the reign of King Jeongjo of the Joseon Dynasty), in 1866 (the 3rd year of the reign of King Gojong of the Joseon Dynasty), in 1906 (The Korean Empire), and again in 1960. Notably, this temple has two Daeungjeon Halls, one situated in the upper area and another in the lower area of the temple. The upper Daeungjeon Hall has a gable roof and measures three kan (a unit of measurement referring to the distance between two columns) at the front and two kan at the sides. The eaves of the roof are supported by a system of brackets placed both on and between the columns. The interior floor of the building is made with bricks, some of which are engraved with eight-petal lotus patterns which appear to have been made during the Unified Silla Period. The upper Daeungjeon Hall, with its unusual support structure for the eaves, is an important relic for studies on the history of architecture in Korea. In addition, the hall houses valuable cultural assets including the Iron Seated Bhaisajyaguru Buddha and Stone Pedestal of Janggoksa Temple, Cheongyang (National Treasure No. 58), and the Iron Seated Vairocana Buddha and Stone Pedestal of Janggoksa Temple, Cheongyang (Treasure No. 174).