The Lab. Sometimes called The Fortress of Solitude, or the Secret Nuclear Bunker, or The Laboratory, or Mom's Basement, or …

Some stuff typically found in The Lab:
I'm jealous of the lab John Doran has assembled ( http://timefracture.org/lab.html ). At first it appears to be a serious engineering facility, but the very last picture at the bottom gives it away.
Mad Scientist's Plot Thwarted By Budget Cuts – Onion August 27, 2003
If you see any of these items, you are most likely in a mad scientist's laboratory:
"PUSHBUTTONS FROM THE DEMENTED SCIENCE MUSEUM" by W. Beaty 2004
antigravity boulders by Bill Beaty 2003
MISCELLANEOUS SCREWY IDEAS by W. Beaty 1997 such as
What's a good way to fund building a prototype "mechanical smoke ring"? – DavidCary