An abandoned fort that was used to defend the British during World War I is up for sale, along with the entire private island it sits on. It is located off the coast of Pembrokeshire in the United Kingdom.The fort, called Stack Rock Fort, is a true fixer-upper to anyone willing to put in the effort. It was built in 1850 and disarmed in 1929. Although it may look creepy on the inside, there is huge potential for it to become the private island home of your dreams.The island, which is currently uninhabitable, also shows promise for development. With beautiful sea views, a large courtyard and plenty of rooms available for transformation, the Stack Rock Fort could be worth the roughly $500,000 for anyone wanting to show off their creative side.Watch the video above to take an inside tour of Stack Rock Fort.