Located out to sea off the coast from Portsmouth Harbour in Hampshire, the 134-year-old Spitbank Fort has been given a £3 million makeover by its owners, who purchased the fort in 2010.
Called Spitbank Fort Hotel, the property boasts an array of lavish amenities including 9 luxury guest rooms, three bars, three restaurants, a rooftop champagne bar, wine cellar, library, rooftop hot pool, sauna and sun decks.
Guests are escorted to the resort from the mainland by private boat, and there is also the option of catching a helicopter which drops passengers at Spitbank Fort's big brother No Man's Land Fort, before completing the final 10 minute journey to the island by boat.
The fort can also be hired for exclusive use, with packages available for weddings, private parties and sailing weekends.
Spitbank Fort Hotel opened in mid-2012.