Daw's Castle is the eroded remains of a Saxon promontory fort on the cliffs about a kilometre west of Watchet. Built or refortified by King Alfred in the late ninth century as part of his system of fortified burhs along the Wessex coast, it was specifically intended to defend the mint and the harbour at Watchet from Viking raids.
There is not much left to see — a low earthen rampart along the cliff edge and a stone marker — but the setting is dramatic, with the Bristol Channel below and the South Wales coast on the horizon. The cliff path from the harbour passes directly through the site and continues along the coast as part of the South West Coast Path. Allow an hour for the walk out and back, longer if you carry on west towards Blue Anchor.