The Ming tombs (十三陵 in Chinese; shísanlíng) are a set of tombs located 50 km north of Beijing in the Changping district, in a valley at the foot of the Tianshou mountain. Here 13 of the 16 Ming dynasty (1368-1644) emperors are buried. The Ming tombs consist of 13 imperial tombs, 7 concubines tombs and an eunuch tomb. Of these only three, Changling, Dingling and Zhaoling, are open to the public. The Ming tombs were built between 1409 and 1644. They have been a UNESCO World Heritage Site since 2003.