Many of the stones and most of the barrows are supposed to have treasure buried under them or near them, but it is dangerous to look for it and there are many stories of foiled attempts. The Caractacus Stone, for instance, standing on Winsford Hill, Exmoor, is said to be haunted by a ghostly team and their foolhardy driver who tried to uproot and drag the stone away to get at the treasure it conceals. The stone overturned the waggon and team and crushed the greedy waggoner. On foggy nights they are still to be heard and met.
From the 1965 book of ‘Somerset Folklore’ by Ruth Tongue (p12) – she heard the story from “A Bossington blacksmith, 1946, and a Hawkridge gardener, 1956.”