Remains of an ancient city, rumored to be haunted, litter the pacific island of Pohnpei.

When a perfect triangle is found in the middle of a unpopulated portion of Australia, experts begin to wonder whether or not the design is man made.

These Transylvanian burial mounds may be the resting place of Vlad Dracula, "The Impaler."

What could be the cause of this excessive gravitational pull? A volcano, or perhaps something else?

Satellite images reveal a strange hole in Antarctica. After scientists rule out whirlpools and sinkholes, they have to look back in time to find the answer.

Satellite photos show a strange circle beneath the ice of an ancient lake. Further analysis shows that these mysterious rings appear each year. What are they?

When the Quickbird Earth Observation Satellite spots an entire fleet of abandoned boats in the middle of the desert, researchers attempt to come up with an explanation.

The search for Nazi treasure leads to a secret underground bunker.

An image taken by GOME shows a strange, pulsing force spreading across North America. What on Earth is it?

A commercial satellite imager spots something strange in the middle of a vast desert. It looks like an airport runway, but there are no planes. No government claims ownership of this strange place.

Scientists are baffled when a seemingly huge tsunami headed straight for Hong Kong suddenly disappears in the water.

Experts investigate a river surrounded by death.

A mysterious shape in the water leads people to believe a giant monster is roaming Loch Ness. Is that really what’s going on though?

Ghost lakes have existed for millions of years, but they just recently started showing themselves. Geophysicist Helen Fricker explains how scientists are moving forward with this discovery.

A satellite captures an image that uncovers the entrance to an underground complex. What is being built there?

A military analyst notices a familiar military plane in the middle of a Chinese city. The question is, is the plane real or just a model?