Massive sinkholes on a mountain in one of the most remote places in Venezuela.

Henry Ford's failed rubber plantation in the middle of the Amazon rain forest.

An isolated dive site teeming with cnidarians.

Described as "the world's most blinging pool."

At 16,627 feet above sea level, this unstaffed station is the highest in the world.

An exquisite example of Uyghur Islamic architecture.

Be careful not to get trampled at this lively two thousand-year-old market.

The world's largest natural arch was forgotten for over 50 years after its discovery.

This dark, damp, perilous tunnel is the only passage from north to south Tajikistan.

The Avenue of Mausolea is a series of grand palatial tombs.

At 72 feet below sea level, it's the lowest commercial airport in the world.

Once a bustling fishing port, this semi-ghost town is now more than 90 miles away from the shore.

Former island in the Aral Sea used to be a top-secret Russian bio-weapons facility.

Rusting ships sit in a desert where a sea used to be.

World's oldest and largest space launch facility, once a secret missile testing site.

The remains of a monument in the remote Kazakhstani desert dedicated to the only men to die in outer space, the crew of the Soyuz 11 rocket.

The world's most remote permanent settlement on an active volcano.

It might not be as impossible to reach as its name would imply, but just about.

Final resting place of Antarctic explorer Ernest Shackleton.

This abandoned Antarctic research station is a Soviet ghost frozen in time.

Australia's only active volcanoes and highest peak are located on these remote islands thousands of miles away from the mainland.

Considered the most remote point in the entire world.

Naked scientists race around the pole in the frigid cold to try to join Antarctica's exclusive 300 Club.

Largest sub-glacial lake ever discovered.