People walk in St. Peter's Square in front of the St. Peter's Basilica on February 19, 2013 at the Vatican City. Pope Benedict XVI will be hosted in the convent of Mater Ecclesiae (Mother of the Church) offering him a substantial four-story modern home complete with contemporary chapel, garden and a roof terrace looking out from a rise dominated by the Holy See's TV transmission tower. Pope Benedict XVI began a week-long spiritual retreat out of the public eye on Monday ahead of his resignation on February 28 with the field of candidates to succeed him still wide open.