Son La owns following interesting sites. Son La Former Prison and Museum preserves revolutionary remains and exhibits precious objects introducing the historical and cultural traditions of the 12 ethnic groups living in Son La. Stretching out 150m long, ThamTetToongCave is a wonder of nature. Along the walls of the cave, there are numerous stalactites and stalagmites. Ban Hin (Hin ethnic minority hamlet) is marked by the traditions and culture of the Thai. There, tourists enjoy drinking ruou can and watching xoe dance by Thai women. Then visitor like to go to Yen Chau Site to try special bananas, longans and mangoes. In 2nd lunar month, when ban flowers begins to blossom, coloring the mountains in white, Thai ethnic group held Hoa Ban Festival. Boys and girls go flower picking to celebrate the spring and entertain themselves by singing, playing tinh and khen flute, dancing xoe.