Marvel at the size of Noyon Cathedral. Go to a service if you can or just take a seat and appreciate the tranquility.
You'll be spoiled for sightseeing choice when visiting Noyon. Noyon Cathedral is an ideal place to kick off here, but there are plenty of other worthwhile places to discover. Musee Jean Calvin and Abbaye Notre-Dame dOurscamp are near the principal church and will fill in your day nicely.