The bank that helped fund the Mexican-American War and the purchase of Alaska met its downfall after helping Augusto Pinochet launder money.

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

The only tennis court that falls under the jurisdiction of the central bank.

After his presidency, George Washington planned to live only a few blocks from the Capitol building.

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

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

This grisly headstone doesn’t seem to be resting in peace.

‘Bush the old fire dog died of poison July 5th, 1869. RIP.’

An obscure federal monument honors the French diplomat who served as Ambassador to the U.S. during WWI.

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

Part of a WWII submarine is lurking outside the Washington Navy Yard parking lot.

A small token of gratitude from freezing cold journalists who were given a warm haven while covering JFK's inauguration.

A portal into the bricked up canal that runs through the heart of Washington D.C.

A hidden passageway now marks the site of an assassination attempt on Ronald Reagan that some say broke a 140-year-old curse.

A diminutive memorial marks the site of a successful assassination by a right-wing death squad in America's capital.

The early data processor factory founded in Washington for the 1890 U.S. Census went on to become IBM.

Before Metro, Washington had a robust streetcar network—and you see the remains of this infrastructure if you know where to look.

A building shaped like the Army Corps of Engineers logo, because why not?

The fountains of the U.S. Navy Memorial are annually salted with water from the Seven Seas as part of a nautical ritual.

Senators used to relax in the nearly forgotten marble tubs now hidden in the U.S. Capitol Building's basement.

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

A diminutive plaque recalls the treetop sniper who almost killed Abe Lincoln.

Helen Keller once broke ground on this historic center for the study of technologies to benefit the hearing impaired.

This forgotten boat elevator was an engineering marvel in its heyday.