Here is my walkthrough of the Grotto in Lourdes. At 0:46 you can see the repository for prayer intentions. I left many there that people gave me to take on this pilgrimage. At 1:05 you can see, behind glass, the spot from which the miraculously waters originally sprang when St. Bernadette dug with her hands there in obedience to the Blessed Mother. At 2:01 you can see a view of the whole grotto. Notice how smooth the whole thing is from thousands of people touching the rock.