The only National Monument ever to go missing for nearly 50 years then resurface in a dump.

A museum cafe showcases Native American dishes and indigenous ingredients from across the Western Hemisphere.

An unassuming, powerful monument north of the U.S. Capitol bears witness to the resilience of Japanese Americans during a time of grave injustice.

Need a hardcopy of the 50-title Code of Federal Regulations? This is the place.

Railroad officials in the early 1900s sought to spare travelers the sight of Roman soldiers’ private parts.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

One critic described it as "middle Mussolini, early Ramses, and late Neiman-Marcus." Another called it an architectural "natural disaster."

"Congress may voluntarily remain in session throughout the summer, in order that our Congressmen may be protected from the intolerable discomforts and dangers of the ordinary outdoor weather!”

A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

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

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

The tunnel under the Capitol Building where Congress takes out its trash.

The most historic church in Fairfax County played a role in the creation of the American Red Cross.

One of the oldest train stations still standing in Virginia played a vital role during the Civil War.

The last of nine massive kilns that produced many of the red bricks for buildings in Washington, D.C. and northern Virginia in the early 20th century.

A small, forgotten prison cemetery marked only by a wrought-iron fence and eerie depressions left in the ground.

This field of concrete was once an active defense site armed with nuclear warheads.

This unique structure is the only one of its kind in Virginia.

A weathered, American Foursquare-style house originally built for lumber merchant William Wimsatt.

Burke’s oldest cemetery also houses the victim of the county's grisliest murder.

A 14-foot monument marks the resting place of two of the town's earliest residents—and one unknown soldier.

Silverware in the sidewalk outside a grocery store cements this neighborhood’s Italian culinary history.

What was once a true peninsula has now been filled in, causing the water to recede and leaving many streetside "waterfronts" and landlocked "islands."

A mysterious stone embedded at the base of a historic Boston building.