In 1405, Changdeok Palace (Historical Site No. 122) was an annexed palace built after Gyeongbok Palace had been built. However, the palace had been used as the same palace as the main palace since Sungjong, the ninth king of the Chosun Dynasty because many kings lived there. Biwon, the rear garden of Changdeok Palace, is renowned for the garden representing the Natural Beauty of Korea since the garden was the resting place at which the kings of the Chosun Dynasty and their royal families would enjoy elegant and relish scenery and there are a good many ponds and pavilions, and dense forest consisting of old zelkova tree of about one thousand (1000) years, and junipers, and buildings such as Buyongjeon, Younghakdang, Usoomun and Juhabru, the prides of beauty of Korean traditional building in harmony with the garden.