Photos: Inside America's largest haunted house

Photos: Inside America's largest haunted house

Terror Behind the Walls, America's largest haunted house, is located inside the massive castle-like walls of Eastern State Penitentiary in Philadelphia. (Sean Kelley)

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by ABC News

WHAS11.com

Posted on October 18, 2013 at 9:02 AM

Updated Monday, Oct 21 at 10:25 AM

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