There are a fair number of geocaches around Carnegie Mellon.
Geocaches. Let me show you.
I found geocaches in Schenley Park. I was walking in a forest trail, when I noticed there was a geocache on the adjacent golf course. So I stepped out of the trees and someone on the green let me putt. I thought it was funny, that some random woman comes out of the trees and your first instinct is to offer her a chance to hit a golf ball.
This geocache was tricky to find. I had to scale a wall then feel around the hollow parts of a sign.
There are geocaches hidden at UPitt too.