Colonel Denning State Park in Newville, Pennsylvania is the location of this challenging, technical Up & Down. Colonel Denning wasn't even a real Col., he was a Sergeant. Pretty hilarious. These are some of the best mountain trails that PA has to offer, as it is part of the Tuscarora State Forest and the Appalachians. Beginning at the TH just before the campground, the FKT route is an out & back of the Flat Rock Trail to Flat Rock Vista (you must go to the lookout point.) *CAUTION* this trail gets very icy in the colder months.