The earliest stained-glass windows can be found in the Treasury and date from the middle of the 12th century. Those in the nave date from the 13th to the 15th and 19th centuries. The colours used, such as the green in the rose on the north transept, and the blues and reds, have a remarkable transparency.
Many ledgerstones of noblemen and clergy were used as simple paving after the French Revolution. The most exceptional ones were found in the ambulatory. Their simple yet elegant designs bear witness to a high level of craftsmanship.
In the Saint Etienne chapel, you can find a painting depicting the consecration of the cathedral by Pope Eugene III in 1147, which dates back to the 15th century and is one of the only medieval paintings to have been conserved in a church in Champagne Ardenne.
The instrumental part of the organ cabinet is the work of the English organ maker John Abbey, who delivered it in 1849. In 1898, his sons transformed the instrument into a symphonic organ, capable of playing all types of music. It boasts 54 stops.