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

A super-sized promotional trick that is now a D.C. landmark.

The first memorial dedicated solely to the Black troops who fought for the Union.

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

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

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

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

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

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

Largest Roman Catholic church in North America.

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

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

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

It was once the base for a series of domestic terror attacks.

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

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

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."

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

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

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

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.

An easily overlooked memorial to a Ukrainian famine-genocide that killed over 4 million people.