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      Historic lighthouse on the auction block

      The Round Island Passage Light, located near Mackinac Island

      A lighthouse near Mackinac Island is available for purchase.

      The latest bid for the Round Island Passage Lighthouse was $20,000, as of Tuesday. The sale began Monday with an opening bid of $10,000.

      The Detroit Free Press reports the online auction is open to nonprofits only who must register to bid.

      The building with a 71-foot tower is on state-owned Great Lakes Public Trust bottomlands, which isn't being sold.

      The Round Island Passage Lighthouse opened in 1948 to mark a passage between Mackinac and Round islands in Lake Huron.