It's the rare occasion where I have some time to actually sight-see when I am on business. However, on my last trip to Seoul earlier this month I had part of a Saturday to do just that and I headed for the Royal palace which is about a 45 minute subway ride from the hotel I was staying at.
This palace was originally built in the late 1300's and then was burnt to the ground in the Japanese invasion about 200 years later. After another 300 years they pretty much rebuilt it although there are still sections of it still being worked on.
Overall an interesting place although it has somewhat of a foreboding and somber mood to it.
Railton