Originally a chapel of the castle, this collegiate church from the 14th and 16th centuries overlooks the city of Tonnerre. From its forecourt, you will have a breathtaking view of the small town of character and its surroundings. Inside, you can discover an ancient organ, an 18th century pulpit and magnificent stained glass windows, including two 16th century grey stained glass windows. Several concerts are organized throughout the summer for the benefit of the association.