The collegiate church is listed as historic monument since 1963. The history says Pépin le Bref might be buried under the former church.
The crypt is a magnificent example of the carolingian architecture.
The Collegiate church is opened all year long.If you want to visit it you have to ask the keys of the church at the Val d'Ardenne Tourist Information Centre (Vireux-Wallerand) - Place du château.
Opening hours of the Tourist Information Centre:
From April to the end of September: Open every day from 10am till 6pm
From October to the end of March: Open from Monday to Friday, from 10am till 1pm and from 2pm till 5pm, every saturday afternoon from 1pm till 5pm. Closed on Sundays.