Julia starts this walk in the beautiful world heritage city of Bath, where the Kennet and Avon Canal provided a 19th century 'canal superhighway' between the country's two most important ports, Bristol and London. But only forty years later the trade along the canal was usurped by rail travel, leaving the once great waterway neglected and derelict. Julia's 20-mile walk, along what is arguably the most picturesque stretch of the canal, tells the story of how the waterway was restored to its former glory after it was awarded the biggest ever lottery heritage grant. The walk ends at the spectacular Caen Hill flight of locks, listed as one of the seven wonders of British waterways.

• Julia Bradbury