On February 11, 1858, Our Lady our Lourdes first appeared to St. Bernadette Soubirous when she was only 14 years old. St. Bernadette requested to know who this "beautiful lady" was, but the lady would not tell St. Bernadette who she was. She appeared to her St. Bernadette eighteen more times that year, never telling her who she was; until the last time they met. The "beautiful lady" reveled herself to be the Immaculate Conception. St. Bernadette had no idea what this meant. She told her Bishop, who told the Pope. The Pope took this as a miracle from God, as he and his bishops were discerning if Mary had been conceived without sin or not. This is considered to be a miracle because no one except the Pope and his bishops at that time knew the term "Immaculate Conception."
This is a representation of St. Bernadette when she first saw Our Lady of Lourdes in the grotto; it stands 10" tall.