Dillon is situated in a sweeping valley into which the Ruby, Big Hole and Beaverhead rivers drain. Beaverhead River is a blue-ribbon trout stream that's a favorite for expert fly fishermen. There are several museums in Dillon devoted to preserving local history. Bannack State Park is located just southwest of Dillon. It is a registered historic landmark and the site of Montana's first major gold discovery on July 28, 1862. Over 50 buildings line Main Street recalling Montana's formative years.