I've seen a few entrances to steam tunnels... including Beardshear, though they really aren't anything special. Never wandered more than 20' in... I was working so it probally would have looked bad to get arrested while working for FP&M
The basement of Beardshear is pretty odd with that dirt floor...
On a side note it's fun to drive a van up to the Campinelle :biggrin:
As for legal tunnels there is a tunnel between... Spedding and Metals Deveolopment? (I think...) under Pammel Drive, used to also be a fallout shelter
The rafters of Hilton are cool :yes:
As is the roof of the Press Box at the Jack

Been through the Football Locker Rooms and weight room
Locker Rooms at Hilton, as well as the storage rooms
The workshop in Fisher Theater (strangely.. never been in the auditorium, other than being on Stage when it was dark in there)
Never made it to the catwalks in Steven's, but been back/under stage
Been on the catwalks of Music Hall, as well as the roof (Pissed off the building manager because I had a key to it and he didn't)
I have aslo been in the basement of the Library, and once accidently set off the Fire Alarm there (we were going to do it anyways, but we hadn't silenced it yet :unsure:
Also have been to "Fort Knox" - a storage room in the FP&M building. Mostly junk in there, some cool stuff, but the best was file cabinets full of origional and copies of blue prints to like every building on campus, as well as old campus maps
Found foundation drawing for the Jack, found the plans for my dorm room, ect
*Disclaimer - I worked for the University when I saw all of that
For a more legal place to get to - the Workspace in the MU. I wasn't a terribly crafty person but they have some good stuff down there.
M-Shop was a cool place too, don't remember if thats still operating or not