It's been said that the Mona Lisa had jaundice, that she was a pregnant woman and that she wasn't actually a woman at all, but a man in drag. Based on accounts from an early biographer, however, the "Mona Lisa" is a picture of Lisa Gioconda, the real-life wife of a merchant, but that's far from certain. For da Vinci, the "Mona Lisa" was forever a work in progress, as it was his attempt at perfection. The painting was never delivered to its commissioner; da Vinci kept it with him until the end of his life. Today, the "Mona Lisa" hangs in the Louvre Museum in Paris, France, secured behind bulletproof glass, and is regarded as a priceless national treasure.