Say a prayer, bow your head and perhaps even light a candle in Namur Cathedral. This important place of worship may not always be accessible, so check ahead for times if you'd like to go inside.
You'll soon learn why this Namur principal church is popular with travelers. If you're looking for other things to keep you busy, Castle of Namur, University of Namur, and Place d'Armes are in the area too. They won't take very long to reach from St. Aubain Cathedral.