The best fictional worlds make us want to live inside them. They feel alive and give us the desire to want to experience all the things that the characters we love experience. This is one of the great things about theme parks and similar locations, as they create those worlds for us to inhabit. If you're a fan of Harry Potter you can, normally, go to Universal Studios, in either Hollywood or Florida, and get yourself a real glass of butterbeer just like Harry, Ron, and Hermione. But now, you don't even halve to do that, as long as you live in the U.K.