A series of Marian apparitions to a peasant girl (now saint) named Bernadette Soubirous on this day in 1858. The site of these apparitions has now seen 67 miraculous healings confirmed by the secular board of medical doctors tasked with finding any medical explanation for claims made.
It also led to the Pope defining the Immaculate Conception as dogma (but not creating it, indeed there is written documentation for the Christian belief in the Immaculate Conception going all the way back to St. Ambrose in AD 340 and possibly before, and, of course, loads of implications of it in scripture itself).
Learn more about the apparitions and history.
Catholic Bricks 