If you have access, several of the better private courses in Montgomery County, MD -- Congressional, Columbia, Burning Tree, Chevy Chase, Bethesda -- are very close to the northwestern part of the Beltway. (Technically the signs for 95 take you the other direction around DC, but it's a practically identical distance.) Schedules permitting, I'd be happy to host you at Bethesda CC, which is about five minutes from exit ramp to bag drop.