Changdeokgung Palace, February 2015. The UNESCO World Heritage listed complex of Changdeokgung is one of five grand palaces in the city of Seoul. If you’ve only got time for one, this is where you should head! Originally built in 1405, a number of Joseon Dynasty kings lived here over the years, chiefly due to the stunning beauty of its palace gardens. Today the palace can only be visited as part of a guided tour. And it all starts here at the main gate (Donhwamun).