Pictures of the Ronquières canal lock in Belgium.
More information about this lock can be found at http://users.skynet.be/p.woinin/Ronqstre.htm
Look at the items next to it to get an idea of the scale. Heck, this thing will hold a ship!
It's at least half a mile up the slope. Since it was wintertime when I was there, we just drove between the points rather than walking through the cold.