Yesterday we have been to the Hwaseong fortress in Suwon. The fortress was build around 200 years ago. The whole complex has a lot of green and a lot of stairs.

It is surrounded by a fortress wall and has several secret gates, which where used to get in cattle and food. Uphill is the comando post from which you are able to see the whole valley.
Downhill there is the palace.

Its quite well maintained. There is a walk through the whole building and courts. Most of the rooms are locked but some are open and decorated.
On the right side of the palace there also is a shrine containing the painting of the late king of this fortress.
For more information read the entry on Wikipedia :-D