Naeuiwon (Korean: 내의원; Hanja: 內醫院) was a palace pharmacy during the Joseon period. Literally, it refers to the place located at the palace for medical issues. Its other names were such as Naeguk (내국; 內局) and Naeyakbang (내약방; 內藥房) which also designated the place or room for treatment. In Changdeokgung palace, tourists can experience how royal physicians worked long before western modern medicine arrived in the Korean peninsula.