The National Aquarium, Washington, D.C., was an aquarium in Washington D.C. It was located in the Herbert C. Hoover Building which is bounded by 14th Street NW on the east, 15th Street NW on the west, Pennsylvania Avenue NW on the north, and Constitution Avenue NW on the south.
Although the National Aquarium in Washington, D.C. was smaller than its Baltimore counterpart, with the experience taking around 45 minutes, it was the nation's first free and public aquarium. It closed on September 30, 2013, after 140 years.