Baegundae

The Bukhansanseong (Korean: 북한산성, "fortress of the mountains north of the Han") is a fortress located in Gyeonggi-do and Seoul, South Korea, dating back to the middle Joseon period. The present fort was completed in 1711, though plans for the structure date back to 1659. The name is also given to a fortress mentioned in the Samguk Sagi, constructed by Gaeru of Baekje in 132 CE, and the two are often conflated although the putative connection is contested.