Changdok-kung (kung/gung is Korean
for 'castle' or 'palace') has a lot of different names; with Biwon (The
Secret Garden in English) probably being the most common. Though calling
it Biwon might get you a lecture
on that being the Japanese name for the place and hence not its 'real' name,
it's still what most people call it.
Unlike nearly
all the other palaces in Korea, Changdok/Changdeok Palace can only be seen as part of a tour.
There
are Korean language tours on the hour from 9 a.m. to 5 p.m. plus English
tours at (usually) 11:30, 1:30 and 3:30. The English tours are generally
a lot less
crowded and take about 90 minutes. Tours in other languages can be arranged
as well.