Mike M.
Google
One of 8 gates that were along the fortress wall around Seoul during the Joseon dynasty. This is the south gate, and it is conveniently located between City Hall and Seoul Station (you can see both from the gate), so I recommend stopping by if you're in the neighborhood. The old architecture contrasted with the modern buildings is really interesting. The gate can be viewed from the street 24/7. However, you can enter the fenced-in lawn and get up close to the gate during business hours (usually 9am to 6pm). There is also small museum display and restrooms. Sadly, the wooden part of the gate was completely destroyed by arson in 2008, therefore the current wooden structure is a 2013 reconstruction. Overall, this is a great glimpse into the history of Korea. Note: you can also visit the east gate in the Dongdaemun area, which was another gate along the city wall.