This Napoleonic fort, on its very own island off the coast of Pembrokeshire is on the market in November 2016 for £550,000. Built in the 1850s to fend off Napoleon III, it was once used as a hotel.
The property on Thorne Island has 10 bedrooms (one as a wargam room) and three reception rooms, plus a waterslide, two bars and a sauna. The Island can only be approached by boat. The accommodation is approximately 8,000 square feet, set on 2.5 acres of land.