Now home to nothing but a weather station and a landing strip, a group of enslaved people were marooned on this tiny island for 15 years.

The second largest monolith in the world was once betrayed by its lover, Ben Aicha.

On one of the world's most active volcanoes, a pebble-filled crater changes color with the wind.

Mysterious hillside with a continuously burning natural fire.

Swirling layers of white and red rock earned these mountains their festive nickname.

The larger of two volcanic peaks rising out of the crystalline waters of the Caribbean.

The “Thumb” of Mauritius provides a 360 degree view of the entire country.

This small group of sand dunes manages to pack in a strange rainbow of colors.

The world's seventh-largest coral reef contains an incredible amount of biodiversity.

Fine dining 20 feet below the surface in the Indian Ocean.

Famous for its bio-luminescent inhabitants, known as "dismalites."

The world's largest bioluminescent area was undiscovered by science until 2005.

This beachside town is home to a diverse nature reserve, multiple cays, and one of the three bioluminescent bays in Puerto Rico.

This remote stretch of sand is a penguin lover's paradise.

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

Suffocating dogs was a common spectacle in the fumes of this noxious cave.

An odd little fishing town that is inundated by tourists looking to be locked up in a cage and surrounded by great white sharks, because why not?

One of the world's largest tanks mimics the experience of watching rare whale sharks, giant rays, and deep sea creatures from the ocean floor.

One of the most elaborate displays of Jellyfish is on display at the aquarium.

Enormous crabs, bioluminescent jellies, and other amazing creatures from the ocean’s depths—some of which are in an aquarium for the first time ever.

The longest timber-piled jetty in the world has an underwater observatory.

All that remains of Jacques Cousteau's 1960s underwater "village."

An underground mansion with fruit-bearing trees and grapes growing beneath the surface of central California.

The final resting place for the remains of 143 Habsburg royalty.