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.”

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

An Industrial Revolution-era public work that purified water using nothing but sand.

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

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

A much-maligned monument to teetotalism.

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

A small triangle of DC grass is the final resting place of one of Sonny and Cher's songs.

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

The national park was once a plantation estate.

Government testing at the asylum briefly explored using marijuana as a "truth serum" on Nazi prisoners of war.

The most accurate timepiece in the world.

A rotating cast of guys and dolls in front of a Washington, D.C. building.

A traveling postal dog covered 48 states and more than 140,000 miles, and he lives on as taxidermy, patched up with a rabbit's foot and a pig's ear.

The only Civil War battle in Washington D.C. took place near this highest natural point in the city.

The oldest continuously operating fish market in the United States.

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

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

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

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

A haunting tribute to pioneering photographer Clover Adams.

Largest Roman Catholic church in North America.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.