As of 2013, there are 3,589 museums in China, including 3,054 state-owned museums (museums run by national and local government or universities) and 535 private museums. With a total collection of over 20 million items, these museums hold more than 8,000 exhibitions every year and 160 million people visits. Some museums of cultural relics, such as the Museum of Qin Terracotta Warriors and Horses in Xi'an, have become internationally known tourist attractions. The government has exchanges of cultural relics exhibitions between museums and promotes the display and exchanges of legal non-governmental collections. The museums are classified into several grades, with the national first-grade museums being the highest classification.