Where can you find a fully functioning windmill in the middle of a residential road? Or reach the very end of the solar system? Where can you walk in the middle of a 15,000-year-old bog or swim in a pool once powered by fruit pastilles? Discover Britain's last remaining railway nursery, Bettys' underground Dive Bar, the fastest rocket to ever have flown in Earth's atmosphere, the secret ceremony room of the Freemasons, and even York's most prestigious postbox.