Take a look at this awesome Civil War photograph of a haymarket in Washington, DC. See the Smithsonian in the background? If not, let us know what those buildings are! Source: Library of Congress.

Step back in time with a captivating photograph of Union Station in Washington D.C. from 1977. Discover the differences in the station's architecture, surroundings, and atmosphere, and reflect on how this iconic landmark has evolved over the years to better serve today's travelers.

An incredible photograph from the Civil War shows three men at the Washington Arsenal. Don't forget to read our guest post by GoDCer Andrew on the explosion that killed 21 at the Arsenal.