The Collegiate Church of Notre-Dame is Huy's architectural centrepiece, a Gothic structure begun in the 14th century on the site of earlier churches and completed over the following two hundred years. The exterior is dominated by the massive western facade and its celebrated rose window, Li Rondia — one of four symbols of Huy that appear on the town's coat of arms alongside the bridge, the citadel, and the Bassinia fountain.
Inside, the treasury is the main draw: a collection of Mosan metalwork, reliquaries, and carved ivories from the 11th to 15th centuries. The goldsmiths and metalworkers of the Meuse Valley were among the finest craftsmen of medieval Europe, and pieces made in this region ended up in the great churches of England, Germany, and France. The treasury makes a strong case for Huy's importance as a centre of medieval craft rather than just a river crossing.