Korea's only official 차이나타운 was formed in 1884, and it's also where 짜장면 was invented for the Chinese dock workers who came through the port, later adapted into the sweeter, darker version Koreans eat today, so this is the one place in the country where eating a bowl of it feels less like a snack and more like visiting the source. Past the restaurant streets, climb the stairs up to 자유공원 for a harbor view and the MacArthur statue. Go on a weekday morning if you can. The famous noodle shops near the main gate can mean a 30 to 45-minute wait on weekend afternoons.