THE CACHE IS NOT AT THE POSTED COORDINATES!
The blue question mark is centered in an area where the Yahara River cuts and flows through the landscape in the shape of a question mark; near Stebbinsville, WI. I figured this was a good a spot for this cache's virtual icon. Solve the puzzle-puzzle below to find the cache's actual position.
rompecabezas: puzzle; jigsaw puzzle
Congratulations to Smashing Ground and j&k&kids on the FTF and Cheviac72 on the FTS!
If you would like a larger version of the puzzle, just let me know and I'll be happy to forward one to you.