The abstract sandstone rock formations at this Algerian national park are rich with prehistoric art.

The deadliest diving spot in the world is also a stunning geological marvel.

Charnel house at the foot of Mount Sinai.

An abandoned outdoor movie theater in the Sinai desert.

Brightly painted boulders scattered throughout the Sinai Desert.

One of the most well-preserved temples of ancient Egypt.

These Egyptian statues have survived for 3,400 years and were an acoustic wonder of the ancient world.

A massive work of modern art that appears to be a crop circle in the middle of the desert.

An endless sea of white conical domes.

Ozymandias’ time-keeping temple.

An ancient instrument used to measure the waters of the Nile so Egyptian farmers would know whether to expect famine or flood.

An ancient city exhumed from the depths of the ocean.

This underwater cave in Madagascar is home to what is thought to be the country's largest fossil graveyard.

The centuries-old trees lining both sides of this dirt road may become Madagascar's first natural monument.

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

Reaching the "Church in the Sky" requires scaling the cliff face of a sandstone pinnacle with a 650-foot drop.

An ocean in the making, in the Ethiopian desert.

An Ethiopian "Jerusalem" featuring a church hewn out of a single rock.

The largest game reserve in Africa is home to thousands of species but refuses to house humans.

Stunning ruins of what was once the center of one of the greatest empires in East Africa.

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

One of only two civilian settlements in the desolate lands of chilly Antarctica.

At the point of oceanic inaccessibility, you can't get farther from dry land without leaving the planet.

The largest piece of no man's land left on Earth.