Collection of vintage trailers double as hotel rooms.

This curiosity shop contains a museum filled with bizarre, unique objects.

A living snapshot of a different time in America is preserved and maintained by a community of volunteers.

Stairs often replace streets on the steep slopes of this old mining town.

The U.S. Fish Commission’s effort to mass produce carp.

Literal "money laundering."

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

Once the supplier for noteworthy projects like the National Cathedral, this old brickworks now lies abandoned.

America's Most Wanted's set resides in this tribute to the history of crime and punishment.

This historic building is now home to the Public Access Corporation for the District of Columbia.

The final residence of an educator, civil rights leader, and presidential advisor was also the first headquarters of the National Council of Negro Women.

The former home of elite checkers battles of the Capital Pool Checkers Club.

This historic boathouse was constructed using salvaged lumber from burned barns.

The former home of Lillian Evans Tibbs and her grandson, Thurlow Evans Tibbs Jr., whose prodigious contributions to music and art spanned more than 90 years.

Home to two notable early-20th-century Black educators, Lucy Slowe and Mary Burrill.

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

The former home of the woman who successfully fought to integrate restaurants in Washington, D.C.

One of the first Second Empire-style buildings constructed in North America.

This apartment building designed by a notable Washington D.C. architect housed the Qing Dynasty's Legation.

The first museum in the U.S. to address human rights issues in China.

A striking memorial to the 21 lives lost in an explosion at the Washington Arsenal

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

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

This statue of the "father of television" stands prominently in the United States Capitol.