Some of the world's busiest museums went dark Tuesday.
The government shutdown -- the first in 17 years -- has paralyzed hundreds of institutions, including all 19 Smithsonian museums, the Hirshhorn Museum and the National Portrait Gallery. These entities house some of the greatest works in the world. They're also free to enter, and routinely draw millions of visitors a year (as early as August of this year, 769,000 people had already visited the National Portrait Gallery alone).
Here's a sampling of the greatest works inside seven of the closed museums: