Plot your trip through the city on the sidewalk.

After surviving abandonment, this powerful Latin American mural is alive again.

The oldest living tree in Manhattan comes shrouded in sinister legend.

An extensive collection of fine art devoted to man's best friend.

The former home of the reclusive "Weird Wendels" who dominated New York real estate a century before Donald Trump.

An unassuming secret door once led to a legendary watering hole.

Fake subway tiles were installed to cover a design that resembled the Confederate flag—it's unclear if the resemblance was intentional.

Where the legendary Orson Welles got his theatrical start before "Citizen Kane."

A living memorial to the trees London lost during the Great Storm of 1987.

A star fort along the C&O Canal in western Maryland that protected America in three wars.

This small pedestal marks the spot of the first lot of land sold in Alexandria, Virginia in 1749.

An original apothecary from 1792.

This cannon dating to 1755 has stood guard at this suburban intersection since 1915.

A massive, majestic mammal watches over pedestrians from his perch atop a former B.P.O.E. lodge.

This colonial tavern played host to George Washington, Thomas Jefferson, and other famous early Americans.

This stately mansion, built in 1787 by America's first Secretary of the Navy, is rumored to be one of the most haunted buildings in Washington, DC.

Before Metro, Washington had a robust streetcar network—and you see the remains of this infrastructure if you know where to look.

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

The oldest continuously operating fish market in the United States.

Part of a WWII submarine is lurking outside the Washington Navy Yard parking lot.

Outside the Department of Transportation, a collection of artifacts honors the history of how we get around.

This lovely picnic spot featuring thunderous jet landings is an aircraft spotter’s dream.

The national park was once a plantation estate.

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