If you've ever ridden the London Underground you may have seen a shadow flicker across your line of sight. Or felt a cool chill on the back of your neck. The London Underground - also known as the Tube - runs through the soil and bedrock beneath the city and, yes, it also cuts through graveyards, crypts, and plague pits. So it's no wonder the world's oldest subway system houses so many ghosts. Mind the Gap, and the ghosts...

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