The Great Allegheny Passage (GAP) is a bicycle rail trail extending 150 milesbetween Pittsburgh, PA, and Cumberland, MD. Defunct railroad lines function as arestored corridor, connecting southwestern PA and northern MD.Visualize a crushed limestone trail that rambles through urban neighborhoods, fertile farmlands, and panoramic mountain ranges. The weight of your body propelsyou through a marvelous natural world that dovetails scenic waterways. Listen...