Halloween has come and gone, but for those who believe in ghosts and spirits, these undead souls roam the world--and our thoughts--year-round. In this slideshow, we'll giggle at ghosts by dressing our dogs up in ghost costumes, satisfy our curiosity by visiting haunted hotels and hotspots, create our own computer-generated ghostography, and see furniture that looks as if it's floating in midair.
Whether you believe in ghosts or not, the spooky innovations in the cluster below are sure to have you take a second look at those familiar shadows in the dark tonight.
21 Ghostly Discoveries and Innovations
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