Over two-thirds of the world's population of giant tortoises live among this coral formation.

Over 4,700 miles of trees being planted to hold back the desert.

This deceptively salty lake looks like blushing pink lemonade.

Nature’s skyscraper launches out of the terrain with attitude.

At the center of an island in the middle of the Indian Ocean is a deep chasm ringed by tall waterfalls.

Réunion Island's highest point is a 2 million-year-old volcano and a paraglider's paradise.

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.

This picturesque island graveyard is the final resting place of dozens of notorious pirates.

A salty cave excavated by elephants and the location of a deadly disease vector.

Abandoned city hidden from the world by tropical forest and isolation on the coast of Kenya.

The true jewel of Africa's west coast known as "Africa's Last Eden."

The world's first and only natural nuclear reactor.

The skeletal remains of the famous hominid "Lucy" were found at this spot.

Supposedly this Ethiopian chapel holds the Ark of the Covenant, guarded by virgins who cannot leave the building.

An ocean in the making, in the Ethiopian desert.

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

The hottest place on the planet.

Mount Nyiragongo has erupted at least 34 times since 1882 and is home to the world's largest lava lake.

The world's only facility where orphaned mountain gorillas are cared for.

Deadliest lake in the world suffocated over 1,746 people in one night.

An enchanting rocky island of scraggly baobabs surrounded by an ancient sea and sprawling salt pans.

The ancient past meets the retro-future at these dinosaur tracks that are protected by a geodesic dome.

WWII-era bunkers are hidden under the beaches of this picturesque park, which is still scattered with wartime watchtowers. .

A wrecked ship dating back to the American Revolution was only recently discovered off the Delaware coast.