Discovered in 1928 in a Bulgarian cave, the Sitovo inscription has yet to be translated. In his attempt to decode the mysterious language, archaeologist Alexander Peev sent the inscription to academic friends and coworkers for input, an action that led to his execution by Soviet spies as they suspected him of sending secret messages.
Archaeologists have hypothesized the inscription comes from about 1200 B.C. and may be Celtic, Slavic, Phrygian, or a long-lost protolanguage of the region. There are even some who suspect the writing is simply a strange rock formation and not an inscription at all.
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Photo Credits / Sources:
Golev at the Bulgarian language Wikipedia [GFDL (http://www.gnu.org/copyleft/fdl.html) or CC-BY-SA-3.0 (http://creativecommons.org/licenses/by-sa/3.0/)], via Wikimedia Commons