50 States of Scary: The Most Terrifying Haunted Houses You MUST Visit in America

13th Door: At this haunted attraction, you can "find yourself plagued by rotting zombies in an old overgrown cemetery and almost trampled to death by the wild horse dragging its hearse and undead passengers. Enter the underground boiler room with its twisting dark passages where rabid dogs have been found feasting on rotting human corps," according to the site.