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Seasoned stomper Julia Bradbury dons her walking boots once again to explore her own British backyard, travelling along the country's network of canals and their accompanying towpath trails. This sees her navigating Highland glens, rolling countryside and river valleys, as well as our industrial heartlands, following these magical waterways as they cut a sedate path through some of the country's finest scenery.

Julia's final walk takes her to north Wales, where 200 years ago the great engineer Thomas Telford had to overcome seemingly impossible challenges in order to access the valuable slate industries of Snowdonia. In doing so, he created a masterpiece of 19th-century engineering - an aqueduct 126 feet high and spanning 1,000 feet across the Vale of Llangollen. To find out why it has become a world heritage site, Julia follows the cut of the Llangollen Canal, starting at the picturesque Horseshoe Falls. Her six-mile walk takes her along the winding Dee Valley, ending on the aqueduct that Telford described as 'a stream through the skies'.