Out of place artifacts mystery
Mysteries enthusiasts call them “out of place artifacts”, they are objects like the alumina wedge of Aiud which simply should not exist.
The alumina wedge of Aiud, for instance, found in 1974, in Romania, two kilometers east from the city of Aiud, on the bank of the Mures river, under a blanket of sand just 35 feet away from some Mastodon (a mammoth precursor) bones, is of aluminum alloy sunken in a layer of oxide.
The wedge of Aiud
The aluminum, however, were found at the beginning of 1800 (and produced in a large amount just from 1885), while mastodon went extinct about 10 thousand years ago, so how these two artifacts were ever found side by side?
Some think the wedge can be a piece of an alien spaceship landed on Earth about 10-11 thousand years ago.
Of course at the moment is impossible to validate this argument, because of total lack of evidence, but the idea continues to charm and brings people discussing since 1995 (when it began to run on Romanian press [link]), despite meanwhile mastodon bones disappeared if they ever really existed.
Moreover, analyses on the artifact that some websites told had been carried out in Swiss (it has for years been the centerpiece of the History Museum of Cluj-Napoca) turn out to have been done in Romania for the artifact's discoverer and never repeated anymore, nor was ever found out where has been done the excavation which made it possible to discover the object.
The Antikythera mechanism
Another famous “out of place artifact” is the so-called Antikythera mechanism, found in 1900 by some spongers pickers off the coast of Antikythera, a small Aegean island.
Inside a shipwreck under the sea, spongers pickers saw a box made up of metal alloy, encrusted in coral, dating back to more than 2 thousand years ago, and entrusted it to the authorities, which transferred it to Athens National Archeological Museum.
Hereafter about fifty years, the box was x-rayed which allowed distinguishing inside interlocking fluted cutting wheel interconnected, wheels that make the mechanism similar to a calculator.
Calculator or astronomical machinery?
Indeed it would have to be ancient astronomical machinery measuring approximately 30x15 cm, thick as a book, made in bronze and originally fitted in a wooden frame, that was used to measure Sun and Moon movement, eclipses, motion relations, phases of the Moon and probably also to establish the Olympics calendar.
What is surprising is precisely the accuracy of the calculation of those movements since the mechanism (also covered with over 2 thousand markings) was built resorting to common materials.
Therefore the machine is technically much more advanced than any other devices conceivable at the time (around 200 B.C.) and any other artifact made over the next 1,000 years since mechanical calendars never carried out until 1050 A.D. So who was able to build it: a skilled Greek workman or alien astronauts? We may never know.