A clone of a cloned tree that was so important it allegedly had its own guards.

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

Housing the National Women's Party since 1929, this historic house is now a monument to the fight for gender equality.

The most accurate timepiece in the world.

Perhaps the most scandalous statue of America's first president.

A brass plaque dedicated to a convicted cannibal hangs in the National Press Club, and that's not even the craziest part of the story.

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

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

The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.

A hoard of sky catalogs, astrophysical journals, even the works of Galileo and Copernicus.

A celebrity from the late Cretaceous period.

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

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

A computer bug so primitive it was an actual insect.

Home to a vast and influential collection of Shakespeareana.

A super-sized promotional trick that is now a D.C. landmark.

A haunting tribute to pioneering photographer Clover Adams.

Cold War intelligence agents monitored communist embassies from an attic in a former pigeon coop.

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

There's a crumbling old mansion inside the Smithsonian National Zoo.

Largest Roman Catholic church in North America.

An obscure public service from the U.S. government that redeems burnt, moldy, and soiled old greenbacks.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

The famous abolitionist’s preserved estate is one of Washington's finest monuments to its great Black citizens.