The perfect opportunity for adventurers to enjoy the opportunity of touring a world heritage site by kayak or canoe in the heart of the welsh countryside built by thomas telford and william jessop in 1885 pontcysyllte aqueduct is considered one of the engineering feats of the industrial revolution the aqueduct took over 10 years to build and is the longest and highest cast iron aqueduct in the world carrying the llangollen canal over the river dee at over 120 feet above ground your journey