Movie studio Warner Studios located at Hertfordshire, Watford, Leavesden, UK in London. Harry Potter and the Goblet of Fire Warner Studios is located just 20 minutes from London, where you’ll find Hogwarts Hall. Dumbledore’s Daughter’s Room, including the Hogwarts Castle, the replica, the actual replica, and so on. There are also Cafe Studio and many souvenir shops. Warner Bros.