Heralding towering windows of stained glass in a beautiful Gothic style, the Sainte-Chapelle is a royal chapel in the medieval corners of Palais de la Cíte where France's kings used to reside. This chapel has the most thorough collection of 13th-century stained glass compared to anywhere else in the world, and holds precious medieval relics of Christendom, including the Crown of Thorns. With an exterior that is deceptively modest, it is easy to look over this royal chapel, but it would be a grave mistake to do so. Sainte-Chapelle holds treasures within her walls that cannot be found anywhere in the world - her intricate, stunning architecture and decor on the inside, and the sheer majesty of the stained glass are truly rare sights to behold. So don't judge a book by its cover, and do drop by for a visit inside this beautiful chapel.