Conveniently located within binocular range of a nuclear bunker, the "summer camp" area was a painfully obvious spy house.

This pun was simply waiting to come to life, and one defense contractor made it so.

A failed piece of Orientalism has become the proud symbol of a community.

An industrial waste tourist attraction.

Sunset Park's Guatemalan community knows to head to the back of this bodega for a taste of home.

This innocent-looking townhome is actually a subway exit.

Just your average Marie Antoinette–themed speakeasy in an abandoned 19th-century subway tunnel.

Nikola Tesla's former home contains an homage hidden from plain sight.

A memorial to the victims of Argentina's "Dirty War."

The narrowest house in Buenos Aires is less than 10 feet wide.

This beautiful fountain was sculpted by a female artist who was ahead of her time.

Museum housed in underground tunnels that date back to Buenos Aires's earliest settlements.

A gateway to a mysterious network of underground tunnels.

A bright little alley in La Boca is a part of tango history.

Buenos Aires' city of the dead contains some very famous remains, including Eva Perón.

A mysterious architectural gem in one of the most elegant areas of Buenos Aires.

A beautiful riverside mansion where the intellectual life of early-20th-century Argentina flourished.

This giant power line tower is a robot that can express its moods in neon.

The house of a former Argentinian president stands protected within a large glass case.

A pocket of serenity in hectic Buenos Aires, complete with a peaceful courtyard and massive library.

This abandoned boat sits on a nude beach, is shaped like a UFO, and is covered in graffiti.

A new kind of theme park for adults off the Las Vegas Strip.

An 1870s ranch for pioneers, rodeo stars, and divorcees was abandoned and left for dead, until the city reopened it for exploration.

This former Mormon settlement is reemerging from the receding waters of Lake Mead.