Sainte-Chapelle stands squarely upon a lower chapel which served as parish church for all the inhabitants of the palace. This chapel, which is rather plain, is dedicated to the Virgin Mary. A souvenir stand often occupies most of the chapel today.
The most visually beautiful aspects of the chapel, and considered the best of their type in the world, are its 6,458 square feet of stained glass windows of the upper chapel, surrounded by delicate painted stonework. The windows are in deep reds and blues and illustrate 1,130 figures from the Bible. The rose windows added to the upper chapel in the 15th century.
Nearby is the Conciergerie, which can be accessed on a combined ticket with Sainte-Chapelle. Paris' oldest prison, it is where Marie Antionette and later the leaders of the Revolution were held before their execution. ”