There are a lot of great things to do in Seoul, and one of them is the Trick Eye Museum.
It’s just a bunch of walls painted so you can take pictures with them, but it’s a lot of fun.
It’s best in a group, because some of the walls are better with two or three people in them. But it’s fun to do the ones that are just for one person as well.
If you are ever in Seoul, I definitely recommend The Trick Eye Museum.