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Video shot by local newspaper Ziar Piatra Neamt showed the Romanian pillar, which made a hollow sound when tapped. It measured 2.8 meters (9ft).
The pillar resembles one spotted in the desert in the U.S. state of Utah about two weeks ago, sparking international sci-fi speculation based on Stanley Kubrick's 1968 film, '2001: A Space Odyssey.'
In the classic Kubrick movie, an alien monolith is a recurring symbol of human evolution.
A police spokeswoman in nearby Piatra Neamt told Reuters that officers are conducting an inquiry as the structure was "illegally installed" on a protected archaeological site.
The hill is the site of the ruins of the Batca Doamnei fortress, identified as the ancient Dacian settlement of Petrodava.