The B4574 is a road linking the villages of Pont-rhyd-y-groes in Ceredigion, Wales, and Devil's Bridge, 12 miles east of Aberystwyth and noted for three bridges built one above each other as well as for its world-famous falls  and narrow gauge steam railway.  Although barely six miles long, the route has been described by the AA as one of the ten most scenic drives in the world.
Running partly along a section of the upper Ystwyth valley, the route takes in often wild and beautiful scenery. The crumbling remains of the vast Cwmystwyth Mines are breathtaking in their expanse, and have been described as having a moon-scape quality. Other sights include a monumental arch built to commemorate George III's golden jubilee and the Hafod Estate, recognised as one of the finest examples in Europe of a picturesque landscape.