Notre-Dame Cathedral
This is in the back, east side, of the cathedral. According to the pamphlet, the Chapel of the Knights of the Holy Sepulchre has original relics from the Passion of the Christ consisting a part of the original "true cross", a nail from the Passion and the original crown of thorns stored there. I'm reading this from the book---I had no idea while I was there or I would have looked for it. :/ They are presented for veneration each first Friday of the month, and on the Friday's of Lent and Good Friday.