From floor tiles that block cellphone signals to a new chimney, here's how the Vatican keeps information inside the chapel during an ultrasecret papal conclave.

The Vatican is closing the Sistine Chapel to the public as part of preparations for the conclave to elect the next pope after the death of Francis.

For now, tourists are being turned away from one of Rome’s most iconic sites, as the Vatican transforms the chapel from a world-renowned attraction into a solemn space for the College of Cardinals.