When Wales Shook the World

Marking its inclusion in the list of UNESCO World Heritage Sites, the programme celebrates the awesome beauty of the Pontcysyllte Aqueduct in the Dee Valley, which is a masterpiece of engineering. Completed in 1805, Thomas Telford's design was extraordinarily ambitious and marked the beginning of a new confidence in 19th-century engineering. Eddie Butler tells the story of the aqueduct along with three other great feats of engineering in Wales, namely the Severn Tunnel, the Menai Suspension Bridge and Snowdon Mountain Railway.