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

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

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.

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

Corn-inthian columns with a uniquely American take on neoclassical architecture.

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

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

The "lovely red Vega" of the legendary record-settling pilot.

The oldest continuously operating fish market in the United States.

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

An overlooked memorial honoring the local Washington residents who died in World War I.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.

The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

Dating to 1793, this is the oldest building in Poolesville.

The trials and tribulations of marking Poe's grave.

The site where Poe "in great distress, and ... in need of immediate assistance" likely died.

A lawn full of retired spacecraft on display at one of NASA's first research labs.

A relic of FDR's brief foray into utopian urban planning.

A suburban museum tells the story of a historic transportation network and even provides rides in antique trolley cars.

Dogs, cats, horses, monkeys, frogs, and fish are laid to rest at the second-oldest pet cemetery in the U.S.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.