Built just after the American Revolution, the oldest row house in New York City still stands in Chinatown.

During the 19th century, you could pay for violence off a prix fixe menu on this Manhattan street.

This memorial honors thousands of enslaved Africans and their descendants who died in colonial New York.

The world’s oldest and biggest bookstore stocking only mystery, crime fiction, espionage, and thrillers.

A remnant of the original World Trade Center complex continues to serve as a commuter gateway.

The mysterious image is believed to show Edward Hyde, 3rd Earl of Clarendon, in a beautiful blue dress.

This massive, ancient canal system was built using only sticks and stones.

One of Madrid's most beloved statues is of an anonymous citizen.

Over several decades, one of London’s most iconic city gates was dismantled, moved out of the city, and then moved back.

A terrace reminiscent of Rome's Spanish Steps is tucked away in a little park in Washington, D.C.

A brass and marble scale model of the solar system embedded in the concrete.

Coins and medals straight from the mint await visitors to this shop in the nation's capital.

This is the spot where the bloodiest battle in the American Civil War may have started.

The National Park Service’s best-kept secret with views that rival any in D.C.

A street in front of NASA's D.C. headquarters has been named in honor of the Black women who were essential to early spaceflight.

A camera with an ongoing exposure time of 1,000 years.

Unexplained bald patches in the landscape grow and recede over time, as though they are somehow alive.

A less famous, short-lived meeting spot of the Inklings.

Used as an example in one of the first dictionary entries for "museum" in 1706.

This mural of the late David Bowie features eight colorful panels showcasing Bowie’s various alter egos.

This rudder is one of the few remnants of a shipyard that once operated on the banks of the Potomac River.

A disciple of Frank Lloyd Wright built an experimental, partially underground home in the desert.

This former Cold War missile control site played an important role in the creation of GPS.

An out-of-place Air Force radar dome is all that denotes this park as a former missile launch site.