The most accurate timepiece in the world.

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

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

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

The famous abolitionist’s preserved estate is one of Washington's finest monuments to its great Black citizens.

Once the supplier for noteworthy projects like the National Cathedral, this old brickworks now lies abandoned.

"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!”

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

There just so happens to be a court even higher than the U.S Supreme Court: a basketball court in the building itself.

A much-maligned monument to teetotalism.

Rumor has it the uncarved lump behind the three famous suffragists is reserved for the first woman president.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

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

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

Housing the National Women's Party since 1929, this historic house is now a monument to the fight for gender equality.

This lonely waterfront memorial to the men of the Titanic was erected by the "Women of America."

The only Civil War battle in Washington D.C. took place near this highest natural point in the city.

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

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

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

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

A Civil War fort in the middle of Washington, D.C. has been swallowed by a forest.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

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