8 Boulevard du Palais, 75001 Paris France
Sainte-Chapelle, along with Conciergerie, used to be a part of the Royal Palais de la Cité. It is an example of Gothic architecture in France, with impressive exterior and interior.
Sainte-Chapelle is open for visits now. Admission to Sainte-Chapelle is included with Paris Museum Pass. If you don't have one, consider buying tickets online in advance.