The Gyeongbokgung Palace is the biggest and best of the four palaces in Seoul . It is the only one of the four palaces to be opened on Monday. the atea it covers s quite large so you should plan at least three hours here . the late afternoon seems to have the least amount of crowds . There is a smsll heritage village attached to explore . There is a museum to explore as well. The garden area is under construction but should reopen soon . There is a small fee for entry . if you have only enough time for one palace in Seoul , then pick this one .