National Museum of Korea is just one of the attractions in Yongsan-gu, Seoul so you might want to stop by during your trip. Why not take a stroll along the riverfront and watch the sunset while you're here? It's also full of great shops and restaurants, so you can spend the afternoon having a wander. If you want to experience more of the culture Seoul has to offer, head to Yongsan Park, U.S. Army Garrison Yongsan, and War Memorial of Korea.