Lake Mineral Wells State Park is home to Penitentiary Hollow, a sandstone canyon filled with history, legend, and the closest outdoor climbing routes to DFW. This guidebook helps new and seasoned climbers alike with maps, full color photos, route topography, rappel locations, as well as tips and tricks for setting up anchors in this canyon - notoriously difficult due to the bolt set-back. This guidebook takes you into the 21st Century with QR Codes...