Kings Cross Station in London was the shooting location for platform 9-3/4. While in real like platform 9 and 10 are separated by railway tracks, in the movie the arched wall between platforms 4 and 5 was used as the platform 9-3/4. In the station you can now find platform 9 3/4 on the wall in the station Concourse in addition to a shop selling Harry Potter Merchandise.
