Changdeokgung Palace was established in 1405 as a secondary palace. For 270 years, the palace was home to the Joseon government and was also the favored residence of many Joseon Dynasty kings. This makes Changdeokgung Palace the longest-serving royal residential palace. Compared to other palaces, Changdeokgung Palace is well-preserved and still has many of its original features. A particular virtue of Changdeokgung Palace is the way its buildings blend into the surrounding landscape. The palace's rear garden, Huwon, also known as "Secret Garden" is considered an excellent example of Korean garden design and is the only rear garden of any Korean palace. In 1997, Changdeokgung Palace was added to the UNESCO World Heritage List.