In the heart of the city, there is a hill named Khau Ca lying on the side of Nam La stream, this place also preserves historical evidence of Son La Prison - proof of a historical period of revolutionary struggle, the spirit of injustice. of the resilient communists who were exiled by the French colonialists, and the Son La Museum, where many precious artifacts are displayed, introducing the historical and cultural traditions of the community of 12 ethnic groups united together. Together to build Son La into a rich province of Vietnam.