500 years of women in Western art.
I'm a little disappointed they didn't include Ingres' La Grande Odalisque or anything by Vermeer or John Singer Sargent but maybe that's just personal prejudice. Still pretty cool. (Ever since the Mrs. started complaining about those (admittedly dumb) silver naked woman mudflaps I've thought it would be funny to make La Grande Odalisque mudflaps. She contends that the only person in the world that would find that even mildly amusing is me.)