Once home to the Duke of Santo Mauro, this French–style hotel sits on 10,000 square feet of private gardens, complete with pavilions and terrazas, in the heart of Madrid. Guests can stay in the Duke’s bedroom (for a price), but the other 48 rooms are all immacculately designed, with no two the same—as if you’re the guest in a palace rather than a hotel. Expect to walk past Real Madrid royalty, as well as real Madrid royalty, in the halls. —Clara Molot