The Korean War Memorial in Seoul is definitely worth a visit! Dedicated to honoring those who sacrificed during the Korean War, the museum features six indoor halls filled with artifacts, photos, and documents, as well as an outdoor area showcasing tanks, aircraft, and statues. The best part? Admission is free! It's a fantastic place to learn about history and reflect on the importance of peace. You can spend the whole day exploring or just a couple of hours—it's up to you.