Boulder was named for the massive stones strewn about the valley. Visit nearby Elkhorn State Park for excellent examples of frontier architecture. This ghost town stands as a reminder of Montana's 1880s silver boom. Enjoy hiking and picnicking in this area. Boulder Hot Springs, located three miles south of Boulder, began in 1883 as a 52-room resort and spa for the wealthy families in Helena and Butte. Renovated and redesigned, the hot springs offers geothermal pools for soaking and swimming.