216 Old Montauk Highway - Montauk
Not going to lie, this house is pretty cool. You can't get more on the beach than this. Which is why this 3-bedroom oceanfront home will cost you around $17,900,000.
But with beach erosion escalating all over Long Island, and Dune Road basically about to fall into the sea, you'd better be okay with the big possibility of losing all your money on this short term investment...