Halloween Nights return to Eastern State Penitentiary

PHILADELPHIA (WPVI) -- Halloween Nights return to Eastern State Penitentiary.

It's one of Philadelphia's spookiest haunts and it routinely ranks as one of the most haunted places in the world.

Five haunted houses spread out across the historic former prison complex.

There's some brand-new attractions this year as well, including an outdoor scare zone.

Halloween Nights runs on select nights, now through November 8.