Halloween isn't just for the young, you know. Many adults appreciate a bit of raw blood-curdling terror just as much as the kiddies. During the month of October, Unseen Gallery (108 Morningside NE) will host its Art of the Dungeon exhibit featuring various torture and restraint paraphernalia along with art work on the themes of pain and fear. You'll also find costume pieces, creepy note cards and other ghoulish artifacts on display. As per gallery policy, the really twisted stuff will be draped with a veil so kids or extra sensitive adults won't be directly subjected to anything objectionable. In a deliciously weird twist, the organizers will also be passing around a donation box for Amnesty International. Art of the Dungeon opens Friday, Oct. 1, with an all day cookies and punch reception from 10 a.m. to 6 p.m. Runs through Oct. 30. 232-2161.