It would be neat to see some of these places (tomb of the forbidden ladder, bricked in showers at the library, etc), if anyone knows where to find pictures.
Here's an LA times article on the bridge; apparently, it used to be an above-ground bridge and then the ravine it went over was filled in and made part of the utility tunnel system: http://articles.latimes.com/2008/jul/13/local/me-then13
Wicked cool replies, thanks. =)
As a final project for a photography class a year ago, I wandered across town and took many photos of the MIT tunnels. None are online (maybe I’ll put some up someday, but since these pictures worked much better as 16"x16" prints, I’m not sure how well they’d work at a few hundred pixels on a side on a screen), unfortunately. In any case, I recommend everyone who spends any substantial amount of time in the area wander around down there sometime. It’s an interesting eerie mood (especially at 3 AM) found in few other places.
My school has 5km of (heated!) tunnels connecting all the buildings on campus, but since they're open to the public they don't feel eerie at all.
I'd like to see your pictures if you ever put them online. =)