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

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

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

Architecture lovers won’t stop touching the National Gallery's 19.5 degree marble prow.

This robust fence in front of a historic Georgetown home is likely made from hundreds of recycled Revolutionary War firearms.

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

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

A historic arena where the Beatles played their first concert in the U.S.

Washington's iconic carousel has a nice piece of Civil Rights history.

"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!”

Perhaps the most scandalous statue of America's first president.

The national park was once a plantation estate.

A much-maligned monument to teetotalism.

The most accurate timepiece in the world.

There’s a hidden military meme engraved on the World War II Memorial.

Light bulbs, scrap wood, and tinfoil comprise this homemade throne of the gods.

Housing the National Women's Party since 1929, this historic house is now a monument to the fight for gender equality.

The Byzantine, pre-Columbian, and medieval art at this stately mansion are some of the most under-appreciated collections in D.C.

The house where John Wilkes Booth conspired with his co-conspirators.

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

Fittingly, America's museum of architecture is itself a magnificently designed old building.

During the Industrial Revolution this “Temple of Invention” was full of intricate miniature machines and gadgets.

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

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.