The Butler-Freeport Community Trail is a rail trail that weaves its way from Butler to Freeport. For more information check out the official website. That being said, it consists of asphalt, gravel, and dirt and has gentle but noticeable climbs with various sights such as Buffalo Creek, foundations of old homes, farmland, and more. It is a mainstay in training for those living north of Pittsburgh. Although the official website lists a distance of 21 miles, consensus in the local community is that the real number is closer to 20 miles. For the Freeport start variation, the start that I believe is more in the spirit of the game, a hand should be placed on the signage in the parking lot off of Main street to begin and end the journey. The midpoint is to be defined as crossing the small footbridge that demarcates the line between parking lot and trail in Butler.
PA have trail maps where this can be found.
