Fort Independence is a real-life star fort that was first built by the English in 1634, renovated several times, and used as a formidable defensive position by the British during the American Revolution, then by the Americans in the War of 1812. In Fallout 4, the fort is in a bad state of disrepair, but it remains one of the best possible places to found a settlement thanks to its natural defensive facets and plenty of building space. The fort was dubbed the 'Castle' by the Minutemen, who were forced to abandon it due to raider attacks. If you want to settle down here, you'll need to help them regain control of it. The Castle is a pretty scenic place too, with its position on a peninsula offering awesome views across the Commonwealth as well as out to sea - letting you spend quiet evenings up on the ramparts, looking out to the ocean and speculating on what's happening in other parts of the post-apocalyptic world.