The grotto, built by Matthias Staudt and Matthias Diederich, (1906) after your return from a Lourdes pilgrimage, they recreated the pilgrimage church in Lourdes, which you clearly succeeded …
A little bit of info from Wikipedia: "Mary's grottos are referred to as Lourdes grottos, which are replicas of the grotto of Massabielle near Lourdes in southern France and Our …