Wandering trails through the Thoroughfare Gap area around Bull run Mountain. Sights such as an old stone mill, cemetery and civil war era ruins scattered in the woods. Water is plentiful. No pets, open to the public.
I-66 to Haymarket, Rt 55 to Rt 723 on right. Left on Beverly Mill Drive. Follow to the end, parking on left, trailhead on right.
http://www.tripleblaze.com/trail.php?c=3&i=3395