Millions of glowing microscopic organisms light up the waters of this luminous lagoon.

This peculiar lake of pitch is so thick and viscous that one can walk on its surface.

Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.

For those with no fear of heights: a skywalk 4,700 feet up on a Chinese mountain.

This lab's maddening silence is good for business but bad for sanity.

England's oldest surviving hedge maze has been confusing visitors for over 300 years.

The largest catacomb system in the world.

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

The hottest place on the planet.

Ethiopia's "smoking mountain" is in one of the hottest regions on the planet and is home to two lava lakes.

A salty red wasteland in Tanzania is a breeding spot for endangered flamingos.

This "preacher's pulpit" once used for pagan ritual, is home to a new, and dangerous ritual.

A stunning silver lining to global warming's gloomy cloud.

Walk 2,300 feet above the ground on the "Troll's Tongue."

Cretean quarry suggests real-life site for ancient Greek myth of the man-eating Minotaur in his labyrinth.

The tallest stationary dunes on Earth also happen to sing.

A remote forest of stone pillars along the Lena river.

Fall down the rabbit hole into a surreal journey of human consciousness "from ass to soul."

An eatery for UFO seekers on the Extraterrestrial Highway.

In the middle of an extremely unforgiving and desolate high desert is the most secret military facility in the world.

A lovers' beach, tucked below the surface of the island, provides a safe haven for romance.

Extraordinary sculpture garden created by an eccentric English poet.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

An Italian hillside ghost town.