Welcome from Manassas. George Washington National Forest offers a huge area to trek, camp, etc. I used to live in Alexandria and it was about a three hour drive. You might have heard of Flagpole Knob in GWNF, likely the most popular location for everyone. In West Virginia there is a section of trail called Canaan Loop, its near Davis.
I plan to start getting back out into those sectors this summer, I still have a few more things to install.