Anita Rani presents a guide to the coastline of Wales, beginning by exploring the legends of Harlech Castle, an infamous site of rebellion and uprising built directly above the sea. In Pembrokeshire, Anita unravels the little-known story of the last invasion of mainland Britain that is commemorated by a 30-metre, hand-stitched tapestry, and on the shores of the River Teifi, she takes to the waters in a coracle.