How to Find Us
Mystery Hill is centrally located in the heart of the Irish Hills of Michigan on the corner of US 12 and Boardman Drive in Onsted, Michigan. We are just opposite the entrance to Hayes State Park, very close to the Michigan International Speedway and minutes away from Brooklyn, Michigan.

Mystery Hill 7611 US 12, Onsted, MI 49265 Phone: (517) 467-2517 Google Interactive Map BUSINESS FOR SALE This business is for sale. If you are interested in learning more, contact Keith at (517) 902-8757. Sorry-Closed for 2022 season.