This icon of the Atomic Age now lays dormant.

Non-profit time travel mart sells goods you would need for a trip through the fourth dimension.

A look into the Church of Scientology's deeply unfavorable view of psychiatry.

The ghostly remains of an accidental sea.

This monumental fountain has moved around the city multiple times.

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

The name of this tiny pocket park tucked between two buildings on Manhattan's Upper West Side is Latin for its location: "seventy-one."

The abandoned coal loading dock is a canvas for unsanctioned art.

A mysterious air force base built to resemble a Long Island fishing village.

Why have you never heard of the second most popular tourist site in New York?

The Dover International Speedway is home to a towering, concrete-skinned, racecar-hungry behemoth.

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

Peek through the gates at this oasis from the city, full of Old English charm.

Decades after testing the polio vaccine on unwitting patients, this historic mental hospital sits in ruin.

One of the few surviving examples of the first lock and dam system built on the Ohio River.

These pretty kitties killed and ate as many as 135 railway workers.

To find the "unicorns of the deep" you've got to go downstairs.

Years of archaeology, just chillin' by the water cooler.

An alley covered with 20 years of bubble gum.

An iconic location along the Los Angeles River where countless movie scenes are filmed.

Historic funicular railway, believed to be the shortest railroad in the world.