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Things for teens in Manchester
(feddit.uk)
Museum of Science and Industry (if they're into that sort of thing)
Taking your kids to the library might sound like a crazy idea but bear with me a moment. Check out the John Rylands library on Deansgate. From the outside it looks like a gothic church, you enter through a very modern gift store / cafe, walk up some stairs and then suddenly ... you're in Hogwarts! Well, not quite, but it's an amazing Victorian building with lots of corridors and rooms and strangely-placed staircases and all that sort of thing. And the main reading room really could be straight out of Harry Potter.
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