The US government has been secretly digging tunnels for decades, with some speculating that they are being used to hold alien or UFO material.

A striking image captured by NASA has renewed speculation about the possibility of life on Mars. The photo reveals a deep,circular hole on the Martian surface and scientists believe it could be a ...

So, let’s say the worst happens, and Earth gets invaded by aliens. Not the friendly kind offering galactic peace treaties, ...

Add Yahoo as a preferred source to see more of our stories on Google. Looking for an adventure that’s cool (literally) and completely out of the ordinary? The United States is home to some of the ...

Looking for an adventure that’s cool (literally) and completely out of the ordinary? The United States is home to some of the world’s most fascinating cave systems, each with its own story carved by ...