Washington, D.C.

Washington, District of Columbia (commonly known as Washington, D.C.) is the capital of the United States of America.

The Titan's Curse
During the quest to free Artemis Grover Underwood and the Hunters, Zoë Nightshade, Bianca di Angelo and Phoebe, stopped to take a quick rest and went to visit the Air and Space Smithsonian. Percy Jackson secretly followed them there with Blackjack and witnessed Atlas growing Skeleton Warriors. Atlas finds Percy spying on him and unleashes the Nemean lion.