The Sistine Chapel has closed its doors to become a temporary papal polling place. While the world largely knows about the Renaissance-era chapel — its lavish artistry showcasing the works of Michelangelo and Botticelli — the Apostolic Palace holds a papal retreat, Cappella Niccolina (Niccoline Chapel), the Pope's so-called private chapel within the Vatican. The "small and secret" chapel is not even mentioned on the Vatican's website of basilicas and papal chapels. but those who have seen it say it is "every bit as beautiful as the Sistine Chapel." -- By Vera Chan, Yahoo!