Heunginjimun Gate
Also known as Dongdaemun Gate (Great Eastern Gate), this massive, elaborate structure is one of the eight gates that protected the outer wall of Seoul Fortress during the Joseon Dynasty. Originally built in 1396, the towering two-story hipped roof features the distinctive curved edges of East Asian architecture. The gate fell into disrepair and was rebuilt in 1869, and in 1963 was designated a National Treasure by the Korean government.