Back in 1974, a group of workers in Romania discovered three different objects 10 meters deep in a sand trench. Two of the items were prehistoric elephant bones that have been dated as old as 2.5 million years ago. The third object however, is an aluminum wedge that was found together with the ancient bones. This discovery dumbfounded most researchers, as aluminum was difficult to create even by 19th century standards. While some call it evidence of extraterrestrials, others are calling it a hoax. Whatever it is, we may never know.