Suwon, the city where I live, is famous for its fortress. Even though it was originally built over 200 years ago, it is almost perfectly intact. When you visit, you can walk all the way around the fortress, a trip that lets you see a lot of the city and takes roughly 3 hours.
The way the fortress snakes its way up the hill brings back memories of the Great Wall of China
Here you can see how the fortress goes right through the middle of the city
A view of Suwon from a high point on the fortress