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

A much-maligned monument to teetotalism.

The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.

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

Go take a picture with the inventor of the daguerreotype photographic process.

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

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

A public art jibe at one of the United States’ oldest and longest-serving senators.

A small triangle of DC grass is the final resting place of one of Sonny and Cher's songs.

An original apothecary from 1792.

The 28,000-year-old specimen is remarkably intact.

The whole world in one water tank.

Using a massive antenna made up of five miles of wire, two scientists tuned into organic radio waves from the planet Jupiter.

A 19th-century smallpox cemetery is being reclaimed by scrub forest and sand dunes.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

A diminutive memorial marks the site of a successful assassination by a right-wing death squad in America's capital.

Behind an abandoned storefront is an example of pioneering 1930s gas station architecture.

On the Fourth of July this area will transform into a Pompeii-like storm of falling embers and ash.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

One of the most influential presidents in U.S. history wanted only this plain, elegant monument as his lasting memorial.

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

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

The iconic D.C. restaurant where the Cuban Missile Crisis was negotiated, now a Walgreens.

A clone of a cloned tree that was so important it allegedly had its own guards.