The oldest farmer's market in America is so ancient it was approved by the King of England.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

The romance of early commercial flight still fills this Art Deco destination.

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

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

A tribute to the pop culture icon overlooks this Washington D.C. intersection.

For 60 years, the academy had no permanent location until members voted Washington D.C. as its forever home.

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.

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

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

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

An amazing example of early-20th-century architecture, this church features marble transported from Utah.

This grand gothic brewery has been pumping out suds for over a hundred years.

A bas relief commemorates the "Nuns of the Battlefield" who cared for soldiers on both sides of the conflict.

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

Atop this media building, two hives containing more than 30,000 bees keep the surrounding area vibrant.

Was there a small "backpack nuke" hidden in the attic? JFK apparently thought so.

The sculptor was instructed to add “stallion attributes” to the general's bronze mare.

This statue pays tribute to the iconic musician in the place where he recorded his final studio album.

One of the world's earliest skyscrapers.

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

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