Vincent van Gogh Sold Very Few Paintings in His Lifetime

Filippo Brunelleschi's experiments and Leon Battista Alberti's 1435 treatise gave painters a method for creating realistic depth on a flat surface.

Found in Austria in 1908, the small limestone figure is one of the best-known prehistoric artworks.

Vincenzo Peruggia took the painting, and it was missing for more than two years. The theft made the portrait far more famous.

Teenagers found the painted cave in southwestern France in 1940. Its walls hold hundreds of animal images, including horses, deer and bulls.