I have a book at the house - "Short Bike Rides in and around D.C." and I know they have a few in the Arlington area (off road - bike path sort of jaunts). I noticed one started at the Cemetary and may have hit the Pentagon. I can check and post something - not tonight, I'll be out - but soon.
(oh...that reminds me. I owe Nicole some info on data from my Garmin).
Hmmmm.....