This cache takes you to one of the coolest weird sights I know of in the Western suburbs.
Numbers required to solve for the final can be found on a sign on public property directly in front of the really cool thing. You are looking for two 3-digit numbers on the back of the sign. Feel free to gape and drool at the really cool thing (…or the sign. This is your adventure - you do you.)
To get to the final, add the numbers you find at GZ to N 41 48.103 and W 088 12.103
PLEASE PAY ATTENTION TO THE PARKING WAYPOINT. It’s the best nearby parking that I could get you that is legit. The absolute best way to get to this is on a bicycle, but a fortuitous LEO encounter when placing this cache confirms that the parking is legal. Just tell them you parked here to walk over and look at the cool thing. Based on my experience with the LEO, it’s all smiles and high-fives.