A wall was built in 1396 around Seoul to protect the city. It was about 5~8m high and 18,5 km long. Until yesterday, I could only remember to see the famous gates in the city, such as 남대문 (Namdaemun) or 동대문 (Dongdaemun), but no wall. But yesterday, we’ve made a 10km long hike along the northen part of the Seoul city wall from 혜화문 (Hyehwamun) to 남대문 (Namdaemun). The wall of this trail is so well maintained, that you can walk almost the whole time on the wall.