#18 The Ata Skeleton
This little guy was found in the Chilean Desert back in 2003. The body was found to have significant DNA, which was testable. The body is very tiny, with fewer ribs than most humans and a long head. It is believed that Ata is a premature fetus with some form of dwarfism, though no gene for that was ever found.
#17 The Winnipesaukee Mystery Stone
Even though this stone was found next to a lake in 1872, people still have no idea what it is to this day. It is an egg-shaped, smooth item that is adorned with a number of strange and seemingly random symbols on it. Also, the small holes found in the bottom and top of this egg could only have been created with advanced power tools, which weren’t around when it was likely made.