Relics of the 1894 Midwinter Exposition continue to delight visitors today.

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

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

Built by the patriotic residents of Boonsboro in a single day.

The shelves in the back of this thrift store are devoted to saving, not selling, retro tech.

She stares out across six lanes of traffic, clutching a musket and infant with determination.

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

Soldiers were buried next to Lee's house in the center of Arlington Cemetery to dissuade the general from reclaiming his property after the war.

A much-maligned monument to teetotalism.

The world's oldest continuously operating airport was founded by the Wright Brothers.

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

You could be standing at the site of one of D.C.'s most fatal tragedies and not even know it.

Legend has it that President Grant’s frequent drinking in the lobby gave rise to the term “lobbyist.”

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

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

This exemplar of modernist architecture is meant to captivate and inspire students of the Cooper Union.

Named the fifth most beautiful building in America in 1885, this former courthouse boasts the best view in the Village.

The oldest operating apothecary in the US has treated everyone from Thomas Edison to Mark Twain.

An artist's cute bronze subway sculptures belie his violent artistic past.

Over 120,000 curious objects that have shaped our modern world.

A former major munitions plant that has been converted into a sprawling art space.

The competition: breathe deeply as long as you can.

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

Captain John Smith thought these cliffs were amazing in 1608 but sharks thought so 20 million years before him.