This too-low North Carolina railroad trestle is still a notorious big rig executioner.

The deepest underground city in Turkey was designed to protect 20,000 people behind massive stone doors.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

This African beach is home to thousands of rare mainland penguins that are known for their annoying voice.

Big gun installations, built over a massive cemetery, now abandoned & hidden in trees.

A winding path built in secret on the edge of the continent.

A wall of chewing gum moonlights as collective art.

Couple's personal collection of pinball machines turned public pinball museum.

Less a museum than a bizarre fantasy world created by artists and engineers.

When you've got to go, you've got to go.

The deepest metro station in the world.

This probably wasn't what Mao had in mind.

A giant concrete Brutalist water tower in suburban Johannesburg.

A sobering account of the vibrant multicultural neighborhood that was destroyed under apartheid.

This unassuming museum's slogan translates to “there is a limit of sadness, anxiety has no limits."

A reconstructed medieval gateway that was the magnificent entrance to the capital city dating back to 1037.

This abandoned Soviet circus is slowly being restored to its Communist-era glory.

A forgotten remnant of the Soviet Union, Transnistria is an unrecognized country hidden behind a heavily militarized border between Moldova and Ukraine.

Where better to stay the night than inside a trio of ancient Chinese deities representing "the good life."