The fascinating Harry Potter train platform hidden within London's King's Cross station is called 9 and 3/4, because of its secret placement between platforms 9 & 10.
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Located in King's Cross Station, London's Platform 9 ¾ is quite possibly the most famous railway platform in the world – and it doesn't even exist. (Well, not really…) Based off of Harry Potter series, Platform 9 ¾ is a fictional train platform located in King's Cross Station in London.