0.00/10 2011-02-10 30 minutes.HDHuw Edwards and the history detectives discover a lost church (Tal-y-Cafn), search for the oldest castle (Hay-on-Wye) gate in Europe and find out how the great engineer Thomas Telford built the highest aqueduct (Pont Cysyllte) in the UK.An: 2011Studio: BBC Two WalesPays: United Kingdom