Built in the 12th-century, the magnificent Cathedral of Saint-John is renowned for its 13th- to 14th-century stained-glass windows. The large rose window dating from 1392 allows in a kaleidoscope of colorful light. 

The cathedral is mainly Romanesque with a Late Gothic facade. One of the most interesting features is the astronomical clock created by Nicolas Lippius in 1598. 

The cathedral also has a remarkable bell (cast in 1622) named "Anne-Marie de la Primatiale" that is one of the largest ever made and is only rung on Catholic feast days.

 For a good view of the cathedral from a distance, go to the embankment near the Pont Bonaparte.