PHILADELPHIA, PA - OCTOBER 24: A couple gazes up at a gargoyle at the "Terror Behind the Walls" haunted house on October 24, 2017 in Philadelphia, Pennsylvania. The haunted house covers 11 acres of the Eastern State Penitentiary, which operated from 1829-1971 and imprisoned famous criminals like Al Capone. In its 27th year, the Halloween fixture hires nearly 300 seasonal actors and staff for 32 nights of tours, with ticket sales generating 50% of the U.S. National Historic Landmark's annual revenue. (Photo by Mark Makela/Getty Images)