Every year, in October, there is a special pilgrimage in Lourdes called the Rosary Pilgrimage, organized by the Dominicans. It is meant to honour Mary's repeated apparitions to Bernadette Soubirous in the cave of Massabielle in 1858, in Lourdes (those apparitions took place in the 19th Century). The cave itself is now a very famous landmark for catholic pilgrims.