Pope Francis is breaking with tradition when it comes to where he will be laid to rest – choosing a light-filled basilica with an intriguing history instead of the grottoes of the Vatican.

A conclave to choose a new pope normally takes place 15 to 20 days after the death of a pontiff, meaning this conclave should not start before May 6.

The basilica will be kept open until at least midnight on Thursday to allow the faithful to mourn. Francis' funeral will be held Saturday at 10 a.m. (2 a.m. ET) in St. Peter’s Square, after which the Vatican press office is expected to release details of the conclave that will elect the next pontiff.