A few months ago I visited the London Science Museum, and in the basement is this wonderful room filled with old locks. 3 sides of the room are dedicated to displays of the history of locks around the world. In the center of the room is a set of huge oversized lock cutaways that you can practice opening and instructions on how to pick a lock are posted. The 4th wall is dedicated to safe locks. I spent 3 hours playing in there, and can't wait to go back.
Is there anything comparable in the US? There isn't anything in Philly's Franklin Institute, or in Manhatten, I've checked.
-mouse