 At Mutlow Hill the dyke runs through a Bronze Age barrow, which was reused in the Roman period as a temple.Fleam Dyke is one of four substantial earthworks, each a high bank with a ditch on its southwest side, running across the chalk downland ridge that carries the Icknield Way (and the Roman road Street Way) across south Cambridgeshire.The others are Devil's Dyke, Brent Ditch and Bran Ditch.