The most isolated inhabited island in the world is haunted by huge brooding statues and a mysterious past. Science has unravelled some of its secrets, but now, in the second of a two-part investigation, "Horizon" looks for alternative information to solve the remaining pieces of the puzzle.

The islanders believe that the statues literally walked, by magic, from their quarry to the ceremonial platforms. They believe that an old woman's spell on greedy stone-carvers brought the quarrying to a halt, but hazy myth and scraps of legend can be used to re-interpret scientific finds, and finally tell the story of the extraordinary statue-builders.

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