PHILADELPHIA (AP) — An abandoned prison would seem creepy enough around Halloween. Now add blood-curdling screams.

That's the formula for "Terror Behind the Walls" at Eastern State Penitentiary in Philadelphia. It's billed as the nation's largest haunted house outside an amusement park.

The centuries-old prison once housed gangster Al Capone. But it closed in 1971 and is now preserved in a state of semi-ruin.

Each night during the frightfest, about 130 actors in gruesome costumes roam the scary scenes that have been created in the prison yard and cellblocks.

Performers have always been able to sneak up on visitors but not touch them. This year, beware! Actors can grab and interact with those brave souls who wear a special glow-in-the-dark necklace.


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