There are two great places in Seoul to see the traditional Korean house known as Hanok. One is an actual residential area called Bukchon. For a while, I understand that the residents of Bukchon were modernizing their homes, but the city has provided incentives for people to restore them to their original glory. As probably the last neighborhood in Seoul with a large concentration of Hanok, this is a great idea.
In another part of town, you'll find the Namsangol Hanok Village. These aren't replicas or recreations. Rather, they are actual Hanok that have been relocated and restored. The village is like a window back in time.