London Kings' Cross station is not only a traffic hub, but also a place, from which Harry Potter and his friends were departing to Hogwarts. So people come here in search of Platform 9 3/4. And they find it! Here is a trolley half-stuck in the wall, and you can take a photo with Griffindor (or any other school) scarf. There is also a nice souvenir shop nearby, where you can buy tickets to Horwarts Express, wands and school uniform.