This bell is one of the last remnants of the lost city of Triadelphia.

Walk a trail through a historic Quaker town that outlawed slavery in 1777 and was a major waypoint on the Underground Railroad.

An allegorical sculpture in Maryland wears the artist’s politics on its trunk.

An overlooked memorial honoring the local Washington residents who died in World War I.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

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

This bridge over D.C.'s Rock Creek Park is sometimes called the "Buffalo Bridge" because of its four buffalo sculptures, which were cast from a single piece of bronze.

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

The story behind this beloved toy—named for Theodore Roosevelt and owned by his grandson—is more complicated than you might guess.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

Home to items never before seen by the public.

The national park was once a plantation estate.

At 207 feet, one of the world's longest continuous escalators.

The site of the climactic scene from the classic horror film is now a historic landmark.

The word "Watergate" will forever be associated with the infamous scandal in 1972, but this fountain is famous in its own right.

The hippo that stands on this university campus was once a drunken flea market purchase.

Also known as the Founding Church of Scientology.

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

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

A tribute to the beloved, kind-hearted "homeless mayor" of Silver Spring.

Live data is transmitted from the Atlantic coast to instantly recreate the ocean waves in this fountain at the NOAA headquarters.

These five Art Deco homes were meant to solve the "small house problem."

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

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