I spent a few days last month cycling up and down towpaths alongside the Leeds - Liverpool canal for a project. I passed by many interesting landmarks, and under many bridges. I saw locks, milestones, weirs, bluebells, fishermen, boat builders, nature reserves, swing bridges for cows and old mills.
This Guardian article describes how Google are now moving on from mapping the roads with Street View to mapping the country's towpaths, rivers and canals.
Image: Alan Parkinson