On the banks of the Moselle, you can view two monuments to the remarkable technology of the past: two loading cranes, both bearing witness to the former lively trade on the river. The cranes have moveable roofs which move atop mighty round substructures. Inside each is an enormous treadmill which was driven by human muscle power to move the pulleys.The northerly crane was built in 1413, and the one nearer to the Roman Bridge was built in 1774. The area was inhabited over a long period by the families of boatmen and fishermen. Only later were the cranes turned over to various orders of the Church.