Sunday marked the end of a formal mourning period in the Catholic Church for Pope Francis, who died April 21 after 12 years in the papacy. He was 88. The pontiff's death catalyzed an extensive list of traditions dating back centuries,

The conclave is a time-honored process conducted in secrecy behind the locked doors of the Vatican’s Sistine Chapel.

Cardinals of the Roman Catholic church from around the world are gathering in Vatican City to prepare to choose the successor of Pope Francis.