This epic by Technomad is based upon Lord of the Rings by J.R.R. Tolkien. Voldemort kidnaps the four Hobbits from a parallel world. Instead of them Harry, Ron, Hermione and Draco go into Arda to set out on the journey to destroy the Ring.
The story is in large parts identical with its original. Instead of only two, all for cross over at San Gebir to continue into Mordor. The spider at Cirith Ungol is defeated with spells. The company of Orcs that come along are put under Imperius and sent on their way. Harry hurts his leg when he climbs a treacherous stair. Hermione takes the Ring for safekeeping until Harry awakes.
The rest of the story is more along the lines of the original.
There is a PDF available.