The Montagne de Bueren is a straight staircase of 374 steps cut directly into the cliff face above the old city, rising from the Rue Hors-Château to the citadel plateau above. It is an unexpected and impressive sight: a narrow slot in the rock, lined with railings, climbing steeply through the hillside with small gardens and old stone houses on either side.
The climb takes about ten minutes at a steady pace and rewards you with a wide view over the rooftops of Liège and the Meuse valley. At the top is a small park and the former citadel. The staircase is one of the most photographed spots in the city, and it is free and accessible at all times. Going down is harder on the knees than going up.