#Incognita: Rongorongo

On Easter Island a writing has developed in complete isolation, which is unique in the entire Polynesian world. Autonomous writing systems were known only from the Old World and from pre-Columbian Mesoamerica until their discovery in 1868, and therefore, from the point of view of science, this writing occupies a very special position. Numerous attempts at decipherment have been made, none successfully.
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#Incognita: Georgia Guidestones

Ten instructions to mankind, in eight of the world’s largest languages, are carved into solid granite slabs. The monument weighs about 100 tons, and no one knows who commissioned the incredible edifice or who owns the piece of land on which it was built.
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Incognita: The Antikythera Mechanism

The over 2000 year old gear machine from Antikythera is considered one of the greatest puzzles of antiquity and is often described as the “first computer” of mankind. The Antikythera Mechanism was discovered by chance in April of 1900, in a shipwreck near the small Greek island of Antikythera. At the time no one knew how special this perplexing device of remarkable engineering was. Only in the past decades has it undergone serious study.
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