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10 of the world's biggest unsolved mysteries

By: Bryan Nelson on Feb. 21, 2012, 6:41 p.m.
rongorongo script on wooden plank

Photo: christopherhu/Flickr

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Rongorongo is a system of mysterious glyphs discovered written on various artifacts on Easter Island. Many believe they represent a lost system of writing or proto-writing and could be one of just three or four independent inventions of writing in human history.

The glyphs remain undecipherable, and their true messages — which some believe could offer hints about the perplexing collapse of the statue-building Easter Island civilization — may be lost forever.