The most eye-catching new cycleway in Britain for years, the Two Tunnels route plunges deep below Combe Down to take cyclists between Bath and the picturesque Midford Valley. The old Somerset & Dorset Railway's tunnels and viaducts have been turned into a family-friendly bike route which combines with the Kennet & Avon Canal and Collier's Way to form a 12-mile, mostly traffic-free circuit. An unmissable ride.