Cheongju Jeongbukdong Toseong is a Baekje-era earthen fortress on the banks of the Miho River in Ogeunjang-dong, Cheongju. The square earthen wall has a perimeter of about 650 meters, and people come at sunset to see the afterglow and the setting sun. There is a free parking lot and a restroom, and arriving about an hour before sunset lets you capture airplanes in photos as well. Drones and kite flying are prohibited because of the nearby air force base and Cheongju Airport.