Tourists walk in the square as the sun sets behind the statues on top of the Bernini colonnade in St. Peter Square, at the Vatican, Monday, March 4, 2013. The sun sets behind the statues on top of the Bernini colonnade in St. Peter Square, at the Vatican, Monday, March 4, 2013. VATICAN CITY (AP) - The clearest sign yet that a papal election is nearing has arrived, with the Sistine Chapel announcing it is closing to visitors. As of 1 p.m. Tuesday, Michelangelo's frescoed masterpiece will be sealed to tourists as Vatican workers put it into shape for the conclave: In 2005, the last time the College of Cardinals elected a pope, those preparations included installing a false floor to hide anti-bugging devices and attaching the stove, where the ballots are burned, to the Sistine Chapel's chimney. Tuesday also brought a second day of pre-conclave meetings with cardinals to organize the election process and get to know one another. With a handful of cardinals still travelling to Rome, no date has yet been set for the start of the conclave.