Washington D.C.'s most famous pianist, composer, and bandleader still tickles the ivories outside Howard Theater.

This apartment building designed by a notable Washington D.C. architect housed the Qing Dynasty's Legation.

Garments from across the globe call this hidden gem home.

Outside the Department of Transportation, a collection of artifacts honors the history of how we get around.

On the Fourth of July this area will transform into a Pompeii-like storm of falling embers and ash.

The first museum in the U.S. to address human rights issues in China.

Coins and medals straight from the mint await visitors to this shop in the nation's capital.

Railroad officials in the early 1900s sought to spare travelers the sight of Roman soldiers’ private parts.

Depending on who you ask, this controversial treehouse is either a charmingly creative child's playhouse or an illegal encroachment on public land.

An overlooked tribute to one of the most important peace deals in American history.

This groundbreaking 16th-century map is known as "America's birth certificate."

An echo chamber with a waterfall wrapped around its base at the Embassy of Canada in Washington, D.C.

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

The tunnel under the Capitol Building where Congress takes out its trash.

Mysterious installations bring levity and light to a sometimes stodgy city.

Once a sewer culvert, this road tunnel now offers cyclists and pedestrians a subterranean stroll under the C&O Canal.

A memorial to a shareholder activist feared by CEOs around the United States.

The grand marble structure next to the White House is Andrew Carnegie's temple to Pan-American diplomacy.

A replica of the famous memorial statue at the Normandy American Cemetery hides in an office building in downtown D.C.

The oldest house in Washington, D.C. wasn't originally constructed in the nation's capital.

The word "Watergate" will forever be associated with the infamous scandal in 1972, but this fountain is famous in its own right.

The innocent intentions of this monument are somewhat lost in the sculpture's muscled imagery.

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

An ear-piercing buzzer calls lawmakers to a vote with a series of long and short rings to form coded messages.