Free entrance is available on the first Sunday of January, February, March, November, and December and during European Heritage Days. Admission is free for under-18s and EU citizens under the age of 26, on presentation of ID at the ticket office before going to the entrance. Saint Chapelle is a Gem of Gothic Style. It holds famous Christian relics, for example the Christ's crown of thorn. The Church has 15 pieces of 15 meter high stained glasses.