Modern art meets tradition and East meets West at The Leeum Museum. The museum is split into 2 sections, one for Korean traditional art and antiquities, and the other for modern art by both Korean and international artists. I found the Korean antiquities to be a bit boring, and if you're like me, you can speed through that section and dedicate most of your time to the modern art, which includes some awesome larger and full-room installations. You can easily view the whole museum in 2 hours. Since it's walking distance from the Grand Hyatt and Namsan Tower, it pairs nicely with brunch at the Hyatt or a walk up to Seoul Tower for a compete day.