Michigan upper peninsula: The Mystery Spot.
The very definition of a tourist trap.
Did you/have you stopped? LOL I've had the pleasure of driving downstate 3 times since last August and chuckle when I see that. What's kind of sad is the old run down motels on that side of the peninsula. Driving on I75 is hardly a speed trap though. A state police car will float by just to keep everyone honest. My last trip I got passed by state police probably pushing 85 or more. Not far behind were 3, maybe 4 other vehicles keeping their distance but keeping pace with the cop.