The Cathédrale Saint-Bénigne sits on the site of a Benedictine abbey founded over the tomb of Saint Benignus, a 2nd-century martyr. The present Gothic church was completed around 1325; the steeply pointed coloured-tile roof — Burgundy's signature material — was rebuilt in the 19th century.
The most interesting part is below ground: a remarkable Romanesque crypt and the remains of a circular 11th-century rotunda built around the saint's tomb. The rotunda above was demolished during the Revolution; the crypt survived and is one of the most atmospheric early-medieval spaces in France. Free entry; bring a coin for the timed light switches.