The Collegiate Church of Saint-Aignan sits in the quiet eastern part of the old town, away from the tourist circuit, and is less visited than the cathedral but well worth the detour. The current building was largely constructed in the 15th and 16th centuries, though the crypt below dates back much earlier and contains beautiful Romanesque capitals.
The church was built at the request of King Louis XI, who had a particular devotion to Saint Aignan, the 5th-century bishop credited with saving Orléans from Attila. The flamboyant Gothic vaulting of the nave and the Renaissance choir stalls are both fine. The church is often unlocked during the day and rarely crowded.