Strange structures up to 1,300 feet (around 400 metres) long have been discovered deep beneath the ice in Antarctica. The never-before-seen shapes were uncovered when a remotely operated vehicle (ROV) ...

Add Yahoo as a preferred source to see more of our stories on Google. The so-called Candor Tetrahedron. (NASA/JPL-Caltech/UArizona) It would be tempting to assume there's nothing much of note ...

Far below your feet, nearly 1,800 miles beneath oceans and continents, Earth carries two massive scars from its violent youth. They are so large they rival continents in size, yet no human will ever ...