Cathédrale St-Pierre et St-Paul

Troyes' most important house of worship, 114m long, incorporates elements from every period of champenois Gothic architecture. The Flamboyant west facade, for instance, dates from the mid-1500s, while the choir and transepts are more than 250 years older. The interior is illuminated by a spectacular series of some 180 stained-glass windows (13th to 17th centuries) that shine like jewels when it's sunny. Also of interest: a fantastical baroque organ (1730s) sporting musical putti (cherubs), and a tiny treasury with enamels from the Meuse Valley. Back in 1429, Joan of Arc and Charles VII stopped off here on their way to his coronation in Reims.