Park up at SX579673, head in SW direction up towards Gutter Tor, then take the path past Ditsworthy Warren House that will lead you past the Drizzlecombe Monuments, carry on until you get to the ford where the Drizzlecombe Stream meets the Plym at SX589665 cross the stream and carry on up the Langcombe Valley, keep on the left hand side and soon enough you will see Grim’s Grave, it has a retaining circle of 9 stones. if you have time on your side there’s a delightful waterfall (Shavercombe Fall) not very far away at SX595660. where you can enjoy the solitude of the moors,you don’t get many people there. by the way Grim is another word for Satan