8. Inexplicable Wedge, Transylvania
Found on the bank of the Mures River in Transylvania in 1974, this aluminum wedge was burried with 20,000 year-old Mastodon bones, but itself is believed to be about 300-400 years old according to its encasing. Usually, aluminum is found mixed with other metals, but in this case, the wedge was made of pure aluminum, which is interesting seeing as aluminum was only discovered in 1808 and produced in quality in 1885. So where did they get the aluminum from, or is it possible that more than one great mind came up with the recipe to create aluminum?