Hey everyone, I started this thread because I'm trying to figure out where all the underground tunnels are located in Washington, D.C.—or anywhere else nearby...
If you're looking for info on those tunnels, head over to the "Great American Landscapes" subforum. You’ll likely find everything you need regarding the underground layout of Washington, D.C. there.
The Secret Side of Washington, D.C.—hidden spots, subterranean passages, and abandoned buildings.