The Wyoming Territorial Prison is located at 975 Snowy Range Road in Laramie, Wyo. From Interstate 80, take Exit 311. The museum stands on 197 acres and is the only federally constructed territorial penitentiary with most of the original structure preserved, along with several restored historic buildings. The historic site where Butch Cassidy was incarcerated in 1894 hosts an annual Butch Cassidy Festival in June. For more information, call (307) 745-3733 or visit the website at http://www.wyomingterritorialprison.com/.