Collegiate Church of St. Waltrude
The collegiate church of St. Waltrude was built between 1450 and 1691, without the church ever being completed. The present collegiate church is the successor to other buildings that have occupied this mound since the foundation of the first hermitage on this site by St. Waltrude (612-688). During the French Revolution, the building was used as a stable and was almost demolished. From 1803, the collegiate church became the main parish church of the town of Mons.