I've been to the DC Escape Room Live, but not the Alexandria, VA site: https://www.escaperoomlive.com/

I've also been to the MD suburbs for Zombie Escape Room (this was in College Park, MD when we did it but it looks like it relocated): http://www.charmcityroomescapes.com/

Of those two, my group enjoyed the Zombie escape a lot more. That's because the actress playing the zombie was excellent and she provided the extra challenge of avoid contact and slowly reaching more and more of the room.

There is also Escape Artists DC, with 3 different setups: http://www.escapeartistdc.com/

I haven't been to that one yet.

Again in the MD suburbs, my friends and I are about to go to this one literally next weekend, Escape This Live: http://www.escapethislive.com/mainpage1/

And there are two more I haven't checked out yet:

Great Escape Room DC: http://thegreatescaperoom.com/washington-d-c/

Escape the Room DC: http://www.escapetheroomdc.com/index.html