There are five royal palaces in Seoul and Gyeongbokgung Palace is the main one to see. The palace was grand and masculine, and the soft spring blossoms throughout the grounds created an interesting contrast. We spent about 3 hours there, even after skipping a few sections and walking at a hasty pace. If you want to stroll leisurely and appreciate all the details, you can easily spend a whole day at this palace. Visitors can also watch the royal guard changing ceremony (lasts ~30 mins) every hour from 10am to 3pm in front of the main gate. We missed it unfortunately and only got a quick glimpse later when we passed by in a taxi.