Korea national treasure No.41 - Iron Flagpole at Yongdusa Temple Site, Cheongju
국보 제41호 청주 용두사지 철 당간
Images(Source : Cultural heritage administration of Korea)
The flagpole was used to hoist a huge flag or banner called dang at the entrance to a temple during an important event such as a ceremonial ritual in Yongdusa Temple.(more)