Final answer:
Mary appeared to Saint Bernadette in the year 1858 in Lourdes, France, leading Lourdes to become a significant pilgrimage site.
Step-by-step explanation:
In the year 1858, Mary appeared to Saint Bernadette in Lourdes, France. These apparitions were reported to have taken place multiple times, and Lourdes has since become a major site of Christian pilgrimage. Millions of people visit each year to see the place where the Mary appeared to the young Bernadette Soubirous, who was later canonized as a saint by the Roman Catholic Church.