Great Lakes Lighthouse Keepers Association photo
This is the Round Island Passage Lighthouse. It is up for sale and the current bid is 20-thousand dollars. The auction is open only to not for profit organizations. But once you own it, the sky is the limit. You could open a bread and breakfast, or any other feasible use.
The 71 foot tower is made of steel plate and it sits on a giant hunk of concrete. If you want it, here is the link to place your bid!