The Four Lifts can be found in the Canal du Centre between La Louvière and Mons. The road to the lifts (ascenseurs in French) is well-signposted from the E19 highway coming from Brussels.
First I visited Lift no. 3. That one is situated in a small town that has seen better days. I was amazed to see the old buildings that surround the lift: it looked as if I had arrived in Northern England! The Industrial Revolution has left a large mark on Wallonia, and certainly in this region.
A few kilometers away you can take a look at Lift no. 1. You can walk around this one and take a closer look. Unfortunately, there were no ships in the canal, so I haven't seen the huge construction in action.