An echo chamber with a waterfall wrapped around its base at the Embassy of Canada in Washington, D.C.

The National Park Service’s best-kept secret with views that rival any in D.C.

A spectacular tribute to statesman and philanthropist Andrew Mellon.

A muscular Art Deco monument represents the struggle between regulators and unbridled markets.

Outside the Department of Transportation, a collection of artifacts honors the history of how we get around.

"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!”

The discovery site of the "Capitalsaurus," the official dinosaur of Washington, D.C.

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

The story behind this beloved toy—named for Theodore Roosevelt and owned by his grandson—is more complicated than you might guess.

This statue of one of baseball’s greatest pitchers looks like something out of a sci-fi horror movie.

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

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

A historic neighborhood church is reborn as a psychedelic arts collective.

This lovely pocket park is one of the most under appreciated in D.C.

The oldest continuously operating fish market in the United States.

This lonely waterfront memorial to the men of the Titanic was erected by the "Women of America."

Look closely and you’ll notice that the color changes a third of the way up the tower.

Disks are rolled out onto the south lawn to absorb the impact of Marine One's wheels like giant coffee coasters.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

It's not a typo, now say it five times fast!

New York City's first Modernist house.

A Manhattan office building is home to the world's largest chess board.

Tucked away amidst some of the most famous addresses in the world is New York's only fraction of a street.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.