Among the Four Royal Palaces in Seoul, Gyeongbok Palace is the most popular for tourists and is the one included in a half day City Tour of Seoul if you have a really long layover from Incheon Airport if riding Asiana or Korean Airlines (these tours are complimentary). Gyeongbok Palace was the Main Palace of the Chosun dynasty until it got destroyed in 1592 during the Japanese Invasion. The Palace was Founded in 1394 by King Taejo (who destroyed the Goryeo Dynasty in Kaesong), this was the base of the Joseon Dynasty. (the last Dynasty of Korea). In 1867, some of the building were reconstructed but was again destroyed by the japanese during the occupation except for 10 buildings.