Everything you ever wanted to know about the jihadi menance in Falls Church ("greater" FC, e.g. Skyline), Fairfax, and Herndon.
(click the image)
I knew most of this a long time ago, but Sperry puts it in context and provides lots of photos on his web site.
I'd always suspected the 9/11 hijackers crashed at some collaborator's apartment in Skyline, since they were doing their phoney ID business at both Dar al Hijra and Culmore. Sperry confirms (without much detail) that this probably was the case.