Platform 9 3/4 is, of course, fictional, but that hasn’t stopped its setting from becoming a tourist attraction. Due to logistics, the filming of Platform 9 3/4 actually took place between platforms 4 and 5. But so many people came to see Platform 9 3/4 that eventually half of a luggage cart was permanently installed to look like it is going through the archway, and a Platform 9 3/4 sign was put up in honor of J.K. Rowling's books.
You can visit Platform 9 3/4 independently; it’s located outside of the station’s ticketed area, so there’s no need to purchase a train ticket. Visits to Platform 9 3/4 are also included on the many different Harry Potter–themed tours of London. Options include touring book and film locations on foot, by bus, in a black taxi, or in a classic British car.