Warner Bros. Studio Tour London – The Making of Harry Potter is a walkthrough exhibition and studio tour in Leavesden, Hertfordshire, UK, owned by Warner Bros. and operated by their Studio Tours division. It is located within Warner Bros. Studios, Leavesden, in Watford, in southwest Hertfordshire, and houses a permanent exhibition of authentic costumes, props and sets utilised in the production of the Harry Potter films, as well as behind-the-scenes production of visual effects. The tour is contained in Soundstages J and K, which were specially built for the attraction, and is separate from the studio's actual production facilities. Warner Bros. Studio Tour London opened to the public in 2012 and has since welcomed up to 6,000 visitors a day during peak times. TripAdvisor reported that Warner Bros. Studio Tour London – The Making of Harry Potter has been the highest-rated attraction worldwide every year since the tour opened. From Wikipedia
