1. Frisco Highline Trail, a 35-mile run from Springfield, Missouri to Bolivar, passing through Willard and Walnut Grove. Picture: Mile marker 177.

2. North Bend Rail Trail, a 175-mile run in West Virginia--lots of tunnels, with a rougher surface than the Katy or Frisco Trails--I have only completed a small portion of this trail. Terrific scenery. Picture: Coming out.

3. Mount Vernon Trail, a 17-mile paved trail running from Roosevelt Island in Washington, DC to Mount Vernon. Not a rail-trail, it is a wonderful route that allows a rider/hiker to see lots of history at a slower pace. Pictures: Marsh crossing, Jones Pt. Lighthouse (1856), Dyke Marsh, Navy-Marine Memorial, Lincoln Memorial.

4. Washington & Old Dominion Railroad Regional Park, a 45 mile paved rail-trail that goes from Arlington, VA to Purcellville, in the process taking the rider from the metro DC area to the farmlands of western Virginia. Highly recommended. Pictures: Caboose, Rush hour, I-66, Vienna station, Dual usage.

5. Prairie Spirit Rail-Trail, 33-mile trail running from Welda to Ottawa, KS. Terrific facilities. Pictures: Garnett Depot, Pottawatomie Creek, Pottawatomie bridge view, Richmond outskirts.

6. Indian Nations Recreational Trail, 39-mile segmented trail running from Warner to Stigler, OK. Rustic, perfect for mountain bikes. Picture: Vanishing trail.

7.  Chesapeake & Ohio Canal National Historical Park, a 184-mile trail from Washington, DC, to Cumberland, MD.  A rare combination of history and scenery.  Picture: Gate structure with hiker.

Space and time prevents me from posting more pictures--if you would like more from a particular trail, let me know--I'd be happy to share.  To find out what rail-trails are open in each state, check out the Rails-To-Trails Conservancy--another good site is Trails From Rails.