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Doksanseong (禿山城) Fortress, which was built in the Baekje period, is a strategic point with a surrounding view. It stands in the middle of the plains of Osan, Suwon, and Hwaseong with a perimeter of 1,100 m.

The Bojeoksa (寶積寺) Temple is currently located inside the east gate of Doksanseong (禿山城) Fortress. Though there is no accurate record of its establishment, it is said that it was built in the 10th year of King Asin of Baekje’s reign (401) to pray for a complete victory (戰勝) in war.

Osan's Gwollisa Temple, along with Noseong’s Gwollisa, is one of the two Gwollisa Temples in Korea. It was built during the reign of King Jeongjo (16th year) in 1792, and has been named and dedicated to the great success of Confucius.

Geumam-ri Jiseokmyogun is a group of dolmens scattered in the area around 172-1 Geumam-dong, where a total of 11 units were identified. Currently, 9 units are designated as Gyeonggi-do Monument No. 112 (December 2, 1988), while the other two are estimated dolmens.

Oesammi-dong Jiseokmyo, which is 2 dolmen units located in a gentle hill around 384 Oesammi-dong, is designated as Gyeonggi-do Monument No. 211 (January 23, 2006). According to the inspection conducted by the Hanshin University Museum, the one on the north side is numbered 1, while the one on the south side is numbered 2. The No. 1 dolmen is a table-style structure, with its cover stone and support stone intact.