Times have changed since then. The Sistine Chapel serves as the seat of the papal conclave since 1878 and has become a popular site for tourists, welcoming millions of visitors every year.

The Sistine Chapel was used for the ceremonies of the papal court. Only the most important figures of Vatican City were allowed to participate in these ceremonies.

The 133 cardinals will remain in total seclusion within the Sistine Chapel and its adjoining buildings until they choose from among themselves the next pope.

This secretive conclave to elect the next pope is being held in the Vatican's Sistine Chapel. What's it like inside and how is it outfitted for this particular gathering?