The United States General Services Administration is auctioning off six lighthouses, one on in Chesapeake Bay, Maryland and five Michigan's Great Lakes. Bidding starts at around $15,000 and there isn't much action yet! From Mental Floss:
Prospective bidders must agree to put down a $5,000 to $10,000 deposit on the lighthouse they’re interested in. They must also be prepared to renovate the house’s interior so it will meet the legal standards for public habitation. The actual property each lighthouse stands on will still belong to the government, but with the building no longer needed for its original purpose, the new owner will be free to transform it into a bed and breakfast, a summer home, or anything else they envision.