We're conscious that we've just described this as an alien wedge. We have no evidence to say it was made by aliens - it's just that nobody else knows how to explain its existence. It was found in Aiud in 1974, and would best be described as an 'out of place object.'
89% of the composition of the wedge is aluminum; a steel which can't occur naturally. It was invented during the 19th century. The wedge, however, is approximately 11,000 years old. How is this possible?