An old airplane engine forms an unusual cairn atop this Moroccan peak.

Hidden amid a collection of trails is the site of a tragic crash.

A wooden hut from the Heroic Age of Antarctic Exploration.

These giant volcano sponges in Antarctica are thought to be the world's oldest living animal, at 15,000 years old.

One of the most extreme deserts in the world, these snow-free valleys harbor life, despite the hostile environment.

Scientists use one of the saltiest bodies of water on Earth as a terrestrial base for studying water on Mars.

The saltiest lake in all of Crimea is also the pinkest of the pink and teeming with life.

Natural time capsule containing an alien ecosystem.

This beautifully situated lakeside Roman settlement was likely built during the reign of the Emperor Hadrian.

Many generations of travelers have passed through the steep, smooth walls of this canyon.

The world's only above water sand volcano, believed to once be the bathtub of a priest.

A fake mine that was made using real mining techniques which is also used as a community center.

The temporary burial site of the man who shot and killed Jesse James.

This once-popular otherworldly landscape was formed by one of the largest volcanic eruptions in history.

These otherworldly formations were shaped over millions of years by the forces of nature.

As the glaciers retreated out of northern Wisconsin, this unique natural wonder was crafted.

This "castle" is actually a limestone and quartz formation hidden along a trail.

This strange sculpture depicts a giant nightmare hare crushing a man to death beneath its colossal bulk.

These strange piles of magnetized volcanic ash travel across the desert about 50 feet per year.

Human ancestor’s 3.6 million year-old footprints.

The culture that built these Tanzanian ruins displayed advanced knowledge of irrigation technology before mysteriously disappearing.

This rare volcano spews the strangest and (literally) coolest lava in the world.

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

The water here is so clear you can see the mysteriously sunken ship from the surface.