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

A building shaped like the Army Corps of Engineers logo, because why not?

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

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

The privately owned cemetery that holds room for Washington's finest when they step down from life.

The most accurate timepiece in the world.

This grand gothic brewery has been pumping out suds for over a hundred years.

Architecture lovers won’t stop touching the National Gallery's 19.5 degree marble prow.

Once forgotten and built over, this historic Black cemetery now houses a poignant memorial.

Once the largest trading firm of enslaved people in the U.S., this building is now a museum that preserves Alexandria's dark past.

The tomb was guarded by soldiers from both sides of the war, and some left their initials carved in the brick.

The graveyard holding the remains of George Washington's slaves was forgotten for nearly 200 years.

The last remaining building in Washington, D.C., built by H.H. Richardson, one of America's most iconic architects.

Garments from across the globe call this hidden gem home.

Once a sewer culvert, this road tunnel now offers cyclists and pedestrians a subterranean stroll under the C&O Canal.

An amazing example of early-20th-century architecture, this church features marble transported from Utah.

A hidden passageway now marks the site of an assassination attempt on Ronald Reagan that some say broke a 140-year-old curse.

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

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

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

When it opened during the final years of the embargo, all the drinks and cigars were free.

A derelict bit of transportation infrastructure hidden in the woods.

For 60 years, the academy had no permanent location until members voted Washington D.C. as its forever home.

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