The hidden offices underneath Memorial Bridge have been locked up since 1976.

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

A muscular Art Deco monument represents the struggle between regulators and unbridled markets.

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

The Byzantine, pre-Columbian, and medieval art at this stately mansion are some of the most under-appreciated collections in D.C.

Go take a picture with the inventor of the daguerreotype photographic process.

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

A historic estate packed with George Washington's heirlooms, and its own nuclear bunker.

Before Nixon, "watergate" meant canals.

This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.

Through the decades, Black music stars have performed at this historic hub for music and the arts.

D.C.'s first central library was born out of a chance encounter with the philanthropist whose name it bears.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

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

Disks are rolled out onto the south lawn to absorb the impact of Marine One's wheels like giant coffee coasters.

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

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

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

A line of blue paint marks the route of the inaugural parade.

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

A gorgeous mural outside a beloved D.C. restaurant pays homage to famous Black Americans.

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

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

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.