A striking memorial to the 21 lives lost in an explosion at the Washington Arsenal

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

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

This fertility idol of questionable authenticity inspired an iconic Indiana Jones artifact.

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

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

This statue of the "father of television" stands prominently in the United States Capitol.

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

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

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

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

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

D.C. once had its own tiny rival to the New York Stock Exchange.

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

The 28,000-year-old specimen is remarkably intact.

Corn-inthian columns with a uniquely American take on neoclassical architecture.

The U.S. Navy’s preposterously detailed mini battleship took 77,000 hours to complete.

An 18-mile-long tunnel for sewage waste will soon wind within the bowels of Washington, D.C.

A promising candidate for the lost rock laid by George Washington was unearthed, but the hunt is still on.

More than 500 unique and specially designed cases collected by D.C.'s "Harmonica Case Man."

Also known as the Founding Church of Scientology.

The first memorial dedicated solely to the Black troops who fought for the Union.

During Prohibition, the U.S. Congress had an "official" bootlegger, with his own Capitol Hill office.

They sort through millions of dollars worth of diplomatic gifts on behalf of the government.