Seoul's history traces back to 18 BC when it was founded by the people of Baekje, one of the Three Kingdoms of Korea. During the Joseon dynasty, Seoul was officially designated as the capital, surrounded by the Fortress Wall of Seoul. In the early 20th century, Seoul was occupied by the Japanese Empire, temporarily renamed "Gyeongseong." The Korean War brought fierce battles, with Seoul changing hands four times and leaving the city mostly in ruins. Nevertheless, the city has since undergone significant reconstruction and rapid urbanization.
The Seoul City Hall (Korean: 서울특별시청사), located in Jung-gu, is a government building that handles the administrative affairs of Seoul. In front of the current city hall are the old city hall building and Seoul Plaza.
The following are images from various Seoul-related articles on Wikipedia.
Image 1A neighborhood of Seoul in the late Joseon Dynasty (from History of Seoul)
Image 2Gyeonghungak was an attached two-storied building of Daejojeon Hall of Changdeok Palace. The first story was Gyeonghungak, and the second story was Jinggwangru. (from History of Seoul)
Image 3Jibokjae, the Royal Library of Seoul in the late Joseon period (from History of Seoul)