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Scaring people is an art, a lucrative art if done right; the haunted house industry makes $300 million a year in the US. Fast Company recently interviewed the designers behind some of the nation’s most notorious haunted houses to learn just how to design architecture that truly terrorizes. A hint: Set the stage; reclaim an existing, preferably already “haunted”, historic building, add fog, and always “scare people forward.” With this in mind, what famous building would you choose to transform into a terrifying haunted house? Let us know in the comment section below and read all of FastCo's design tips, here.