Cardinals failed again Thursday morning to find a successor to Pope Francis, sending black smoke billowing up through the Sistine Chapel chimney after two more inconclusive rounds of conclave voting.

The Sistine Chapel, a sacred room in the Apostolic Palace in Vatican City, is one of the most famous chapels in the world—and this week, cardinals from around the world will gather inside to choose a new pope.

The doors of the Sistine Chapel at the Vatican were closed on Wednesday, signalling the start of a secret conclave where 133 cardinals from around the world will elect a new pope. Latin chants and organ music had accompanied the cardinals as they processed into the frescoed chapel,