Yes, you can visit Hogwarts Castle at Universal Studios theme parks, most notably at The Wizarding World of Harry Potter in Orlando (Islands of Adventure), Hollywood, Japan, and Beijing. While you cannot "enter" the castle in a traditional sense to explore classrooms freely, the castle houses the signature attraction, Harry Potter and the Forbidden Journey. The queue for this ride is essentially a walking tour of the castle’s interior, featuring meticulously recreated locations like the Gryffindor Common Room, Dumbledore’s Office, the Defense Against the Dark Arts classroom, and the Portrait Gallery with moving paintings. If you do not wish to ride the attraction, you can ask a Team Member for a "Castle Tour," which allows you to walk through the queue at your own pace to take photos without waiting in the ride line. Additionally, for a different but equally immersive experience, the Warner Bros. Studio Tour London - The Making of Harry Potter features the original massive 1:24 scale model of Hogwarts used for filming, which offers a stunningly detailed look at the architecture used in the movies.