The Falkirk Wheel I was chatting with my local used photo gear guy and mentioned that I live next to, and enjoy photographing, the Erie Canal. He told me I should google "Falkirk Wheel" and said I'd be amazed at what I found.
→[More:] I was. Not only does the wheel take the place of 11 conventional locks, it uses only the equivalent of 8 boiling kettles (22.5kW) worth of electricity to operate. It's on my list of Things I Must See In the UK when I manage to get back there again.