Genghis Khan, "Khan of Khans", was the great leader of Mongolians. At the end of 12th century, he united Mongolian tribes and challenged other powers to expand his huge Mongolian empire, which  extended from  South China to the  Caspian Sea.

In 1277, Khan attacked the West Xia Kingdom (presently Ningxia) and encountered strong resistance. He died of disease and age. The great emperor was later buried secretly according to Mongolian custom. It says that after the burial 2,000 men were slaughtered¹ by some 800 soldiers who were in turn executed so that the location of the real tomb remains² a secret.

Genghis Khan's Mausoleum, rebuilt in 1954 185 kilometers south of Baotou, is a mausoleum, in which only his clothing is buried in memory of the great leader. The 5.5 hectares mausoleum includes three giant yurt halls which house coffins³ of the Khan, his wife, his son and his generals.

There are four sacrifice ceremonies held annually⁴ to commemorate⁵ the great hero and leader of the Mongolian people. The ceremony, held on March 21st on lunar calendar, is the grandest. After the ceremony, horse racing⁶, archery and wrestling are held as entertainment.
Notes:

1. Genghis Khan's Mausoleum 成吉思汗陵
2. Caspian Sea 里海
3. West Xia Kingdom 西夏王国