The Ride of Your Life! The Great Allegheny Passage is a 135 mile non-motorized bike trail that links to the C&O Canal Towpath connecting the two great American cities-Pittsburgh and Washington DC. Bike over 300 miles along the Potomac and through Pennsylvania's beautiful Laurel Highlands for an experience of a lifetime. The Great Allegheny Passage is a bike trail for all levels and all ages. Experience American charm in the trail towns along the way, cross the Mason Dixon line, the Eastern Continental Divide, and cycle through the Big Savage Tunnel. Panoramic views, windmill farms, long viaducts and cycling along rivers are just part of the appeal of the longest rail-trail the East Coast offers. The Great Allegheny Passage . . . enjoy the ride of your life.