A home is a retreat—a place to escape the outside world, to be alone, to recharge, to relax with friends. For some, one apartment among many in a building wedged into a sea of other buildings provides all the sanctuary they need. But for others, true escape means getting as far away as possible from the rest of the world, to a beautiful and remote residence in a stunning location—with nobody around for miles. Such retreats try very hard not to be found, but we've hunted down a few of them for your voyeuristic pleasure, searching high, low, and far to find a collection of lovely, unusual, and isolated homes that truly stand alone. (Just don’t go knocking on their doors.)