I read that the crown of thornes is displayed on the 1st Friday of the month. Where? Sainte Chapelle or Notre Dame ?
It lives at Notre Dame. I don't think Sainte Chapelle is "officially" a part of the Catholic Church anymore, but I could be wrong on that part?
It's at Notre-Dame at 3pm. Details.
Ste. Chapelle was built to house the crown of thorns back in the day but is no longer a church; it lives at Notre Dame now.