Saint John's Tower (Vatican City) Saint John's Tower (Vatican City) Saint John's Tower () is a round structure located on a hilltop in the westernmost tip of Vatican City, near Vatican Radio and overlooking the Vatican Gardens. The Medieval tower is located along an ancient wall built by Pope Nicholas III, but it fell into disuse at the beginning of the 16th century. It was rebuilt by Pope John XXIII in the early 1960s. In modern times, the Tower houses papal apartments used by popes when maintenance work is being done on the Apostolic Palace and also is reserved for illustrious guests of the Pontiffs.
Mariology of the popes and the veneration of the Blessed Virgin. They made decisions not only in the area of Marian beliefs (Mariology) but also Marian practices and devotions. Popes promulgated Marian veneration and beliefs by authorizing: new Marian feast days, Marian prayers and initiatives, acceptance and support of Marian congregations, indulgences and special privileges, and support for Marian devotions. The formal recognition of Marian apparitions (such as at Lourdes and Fatima) has also been influential. Since Pope Leo XIII, popes have promoted Marian devotion through encyclicals, Apostolic Letters and with two dogmas (Immaculate Conception and Assumption), the promulgation of Marian years (Pius XII,