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

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

The national park was once a plantation estate.

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

These recently uncovered walls are all that's left of Washington, D.C's first defense contractor.

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

Before Nixon, "watergate" meant canals.

An overlooked oasis of quiet on the grounds of Washington's monumental basilica.

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

There’s a special club house at the top for the bell ringers.

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

A celebrity from the late Cretaceous period.

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

Government testing at the asylum briefly explored using marijuana as a "truth serum" on Nazi prisoners of war.

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

The oldest continuously operating fish market in the United States.

"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!”

This poor little statue is the most vandalized memorial in Washington.

Decades before the scandal, this staircase on the river was a literal "water gate."

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

This sandwich shop has a century-old elevator behind a sheet of plexiglass.

The most accurate timepiece in the world.

A historic ruin just 20 feet away from a busy highway onramp.

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