Trévoux Château was built in the late 13th century by the Lords of Thoire and Villars to protect the town and show their power. The octagonal dungeon has superb views of the River Saône, Monts d'Or, Beaujolais and La Dombes.
The former Dombes Parliament has amazing paintings on the themes of Justice and Peace in the hearing room. It's still a place where justice is done as it's district court. Guided tour from Tourist Information.