An interlocking system of canals connects what was once the industrial heartland of Wallonia with the rivers Scheldt and Meuse. This allowed the shipping of goods to and from France, Germany, and the North Sea. But its creation wasn't easy. A 223-foot drop meant that a series of locks and hydraulic boat lifts had to be created between 1888 and 1917, as a new canal was dug on the outskirts of La Louvière. Now UNESCO-listed, these stretch the waterways between Thieu and Houdeng-Goegnies, around 2 km (1 mile) from the city center (look for "Asc. 1, 2, 3, and 4"). But by the 1980s, barges had become too big for the old system, and a single boat lift, known as the Ascenseur Funiculaire de Strépy-Thieu, was built to accommodate modern vessels. It is the largest of its kind in the world, and tours of the engine room and workings let you see just what a giant it is. Cruises also set off from here to tour the canals and boat lifts in summer (the ticket office is at Strépy-Thieu reception). If you'd rather explore under your own steam, you can rent electric boats (no license required) to chug the canals or cycle or walk the old towpaths.