Dingling, the  mausoleum of Emperor Zhuyijun of the Ming Dynasty and his two empresses Xiaoduan  and Xiaojing is located at the foot of Dayu Mountain. Lying 27 meters below the  surface and covering an area of 1195 square meters, the Underground Palace is  composed of 5 Chambers: the Front, the Middle, and the Rear Chambers, Left and  Right Annex Chambers. The Rear Chamber, 9.5 meters high, 30.1 meters long and  9.1 meters wide is the largest. In the Chamber, the coffin of Emperor Zhuyijun  is placed on the middle of the stone couch, with his two wives' coffins on each side. Over 3000 pieces of historical relics were unearthed from the Underground  Palace. Among them, the Gold Crown and the Phoenix Crown are the unique  treasures.