Between 1760 and 1840 a chain of ironworks established along a narrow strip of hill country stretching for 20 miles at the `Heads of the Valleys' in South Wales took advantage of the rich deposits of ironstone, limestone and coal that were the essential raw materials for the ironmaking process. At Blaenavon can be found the best-preserved multi-furnace complex of its type and period in the world. The surrounding landscape is extraordinary; everywhere you look, there is fascinating evidence of human endeavour over the last 200 years.
Linking the ironworks to the sources of iron ore, coal and limestone is an intriguing network of primitive railways known as tramroads - they even include the longest tunnel in the world, constructed for horse-drawn operation. Hills Tramroad tells the remarkable story of this magnificent feat of engineering.