Historical and cultural tourism in Xinjiang is most attractive for its unique charm. The Silk Road, which runs across Xinjiang horizontally, is known to the whole world. Xinjiang is endowed with 236 ancient cultural sites, tombs, architectures, Buddhist caves, stone sculptures, and modern commemorative monuments of historical, artistic, and scientific value. Within the territory of Xinjiang, there are a number of ancient city ruins such as Gaochang Ancient City, City Site in State of Loulan, and the Site of Niya. The region has established 22 nature reserves.