Damn - watched a programme on this months ago and thought at the time that pictures of it would make a good IoTD. Never got round to looking it up though
It was one of the UK Millenium Projects (another one was the infamous
"wobbly bridge" across the Thames).
The Falkirk Wheel connects Glasgow and Edinburgh by canal, and although there was some discussion as to whether this was strictly necessary, the wheel has now become a tourist attraction in its own right. You can park your car and take a boat trip for the specific purpose of riding the wheel.