Without a doubt the most popular exhibit at the Louvre is Leonardo da Vinci's Mona Lisa. The painting hangs behind an enclosure of bulletproof glass, and theres always a large crowd surrounding it. This photo shows the ceiling of the Apollo Gallery at the Louvre - can you find the three differences in this photo hunt puzzle?
The Louvre also has collections of antiquities of Egyptian, Greek, Etruscan, and Roman Art. The museum also has many sculptures (Venus de Milo), prints, and drawings.