Leonardo da Vinci's masterpiece the "Mona Lisa" was attacked with a mug earlier this month, but the world's most famous painting -- protected by thick glass -- emerged with its enigmatic smile undimmed.

French police say a woman "not in her senses" lobbed the mug at the 500-year-old painting, which hangs in the Louvre gallery in Paris.

The woman, a tourist, was later transferred from police custody to a psychiatric unit, a police spokesman told CNN. The spokesman declined to be identified, and did not say where the woman was from.