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

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

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

Before Nixon, "watergate" meant canals.

The only National Monument ever to go missing for nearly 50 years then resurface in a dump.

An easily overlooked memorial to a Ukrainian famine-genocide that killed over 4 million people.

The institution is sitting on a goldmine of 21,000 paints, varnishes, pigments, and primers preserved for posterity.

Daily lunch spot for many of Washington, D.C.'s cab drivers.

The span is crooked and made from two older recycled bridges.

Washington's iconic carousel has a nice piece of Civil Rights history.

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

A fantastic array of trays and cables once whisked books over to the Capitol at 600 feet per minute.

There’s a special club house at the top for the bell ringers.

Obscure Freemasons still live in D.C.’s largest private residence.

The towering figures were created from the cemetery's fallen old-growth trees.

These recently uncovered walls are all that's left of Washington, D.C's first defense contractor.

An overlooked oasis of quiet on the grounds of Washington's monumental basilica.

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

A heroic pigeon that, through a barrage of gunfire, delivered a message that saved over 100 lives in World War I.

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

The monument's pointy aluminum tip has been melted down by repeated lightning strikes.

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.

This lovely pocket park is one of the most under appreciated in D.C.