The tunnel under the Capitol Building where Congress takes out its trash.

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

After his presidency, George Washington planned to live only a few blocks from the Capitol building.

An unassuming, powerful monument north of the U.S. Capitol bears witness to the resilience of Japanese Americans during a time of grave injustice.

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

Railroad officials in the early 1900s sought to spare travelers the sight of Roman soldiers’ private parts.

A 1,100-ton train fell through the floor in 1953. Workers got it patched up in just 72 hours.

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.

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

Need a hardcopy of the 50-title Code of Federal Regulations? This is the place.

Atop this media building, two hives containing more than 30,000 bees keep the surrounding area vibrant.

A celebrity from the late Cretaceous period.

The iconic D.C. restaurant where the Cuban Missile Crisis was negotiated, now a Walgreens.

An obscure federal monument honors the French diplomat who served as Ambassador to the U.S. during WWI.

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

This leafy estate is worth $18 million and is so grand it has two mailing addresses.

Depending on who you ask, this controversial treehouse is either a charmingly creative child's playhouse or an illegal encroachment on public land.

The “Thumb” of Mauritius provides a 360 degree view of the entire country.

This small group of sand dunes manages to pack in a strange rainbow of colors.

This monument sits at the foot of a mountain from which legend says enslaved people jumped to their deaths.

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

This lonely waterfront memorial to the men of the Titanic was erected by the "Women of America."

Now a living classroom, this house was once the home of Reverend James Clinton Dent, a formerly enslaved man and a pastor.

A historic neighborhood church is reborn as a psychedelic arts collective.