Platform 9 3/4
Platform 9 3/4 is the platform in King's Cross Station that the Hogwarts Express departs from every year on September 1st at 11 AM. In order to access the platform, a wizard or witch must walk into the barrier dividing Platforms 9 and 10, which yields to allow them to enter the platform. The barrier can apparently be sealed; in Harry Potter and the Chamber of Secrets, Dobby seals it in an effort to prevent Harry Potter from attending Hogwarts.
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