Horcruxes and has been hidden in the Room of Hidden Things by Voldemort. Harry, Ron, and Hermione enter the Room, with Harry knowing that he must look for a place to hide things, and find the tiara; but they are ambushed by Draco, Crabbe and Goyle. The diadem is finally destroyed when Crabbe fills this version of the Room with what Hermione believes to have been Fiendfyre; a destructive magical fire. It is not known if the room continues to function after the events of Deathly Hallows; Ron expresses concern that it may have been ruined in all of its forms by the cursed fire. Due to the Room of Requirement not being in a fixed location, it is one of the select locations in Hogwarts that does not appear on the Marauder's Map. Forbidden Forest The Forbidden Forest is a large, dark enchanted forest in the boundaries of the school grounds. It is usually referred to simply as "the Forest" and in the film series as the "Dark Forest". It is strictly forbidden to all students, except during Care of Magical Creatures lessons and, on rare occasions, detentions. Among the plant species within the Forest are trees such as beech, oak, pine, sycamore, yew and knotgrass and thorn undergrowth. Though the Forest is vastly dense and wild, there are a few paths and clearings. Hagrid, who frequently travels into the Forest for various reasons, mostly makes these trails. The Forest is also home to an assortment of creatures, many of them dangerous. In 2017, a Forbidden Forest expansion was added to the Warner Bros. Studio Tour London - The Making of Harry Potter, enabling fans to explore it for the first time. Hogwarts Express The Hogwarts Express is a train that carries pupils non-stop from Platform at King's Cross station in London to Hogsmeade Station, near Hogwarts. Prefects of the school ride in a separate carriage near the front of the train. The compartments on the train appear to be lettered; in Half-Blood Prince, the "Slug Club" meets in compartment C. The train began use in the 1850s. Before that, pupils used to reach Hogwarts on brooms or enchanted carriages. The steam engine used in the film adaptations is the GWR 4900 Class 5972 Olton Hall, but it was not the first locomotive to be disguised as the Hogwarts Express. To promote the books, the Southern Railway locomotive 34027