In 1866, she became a Sister of Notre Dame at Nevers, and she remained there until she died at Nevers on April 16. Lourdes soon became one of the great pilgrimage centers of modem Christianity, attracting millions of visitors. Miracles were reported at the shrine and in the waters of the spring, and after painstaking investigation the apparitions were ecclesiastically approved. Bernadette was canonized in 1933 by Pope Pius XI.