A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

A nostalgic bibliographic gem.

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

The United States Capitol's former columns still stand.

Once the supplier for noteworthy projects like the National Cathedral, this old brickworks now lies abandoned.

A lovely aquatic park built by a one-armed Civil War veteran who made a fortune from lotuses.

A historic cemetery with unique artwork, a Civil War fort, and also happens to be the site of the Battle of Bladensburg.

Politicians, bureaucrats, and military officers gathered in this field near the Capitol to settle their disputes with blood.

Two dozen pinball games hidden away inside a most unlikely location.

This dig site outside D.C. is known for its exceptionally high density of baby dinosaur fossils and dinosaur eggs.

This abandoned asylum was once a state of the art facility before devolving into one of the most deadly mental institutions in American history.