As more than a billion Catholics around the world await the election of a new pope, all eyes will be on the Sistine Chapel, where 133 cardinals will begin the secretive process known as a conclave.

The conclave is the arcane process of choosing the next pope. Cardinals from around the world will gather beneath the frescoed ceilings of the Sistine Chapel in the heart of the Vatican, where they will vote for Pope Francis’s successor by secret ballot.