This "Fatima Chapel" (Chapelle Notre-Dame de Fatima) is dedicated to "Our Lady of Fatima", the Mother of God. It was named after the town of Fatima in Portugal, where Mary appeared several times to some shepherd children in 1917 (i.e. during the First World War). Our Lady revealed three mysteries to the children.
Pope John Paul II attributed his survival of the assassination attempt on him that took place on May 13, 1981 - the commemoration of the first apparition of Mary in Fatima - to Our Lady there. The bullet that almost killed him was later incorporated into the crown of the statue of Mary at Fatima as a votive offering.