Another metal monolith spotted in Romania

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.