Nightmare Dungeon Haunted Attraction in Greenville, South Carolina Nightmare Dungeon Haunted House in Powdersville SC, is the most terrifying haunted house in the Upstate.  Nightmare Dungeon Haunted House is equated with being inside a live horror film.  Each of the haunted attractions is filled with high tech special effects, realistic sets, and professional actors.  Nightmare Dungeon Haunted House will bring your nightmares and fears to life. Read more…