Not the Romans, nor the Greeks - just some stinky methane seeps
Sandstone "pipes" formed in Eocene sands due to the past activity of methane vents revealed by modern erosion in one of the smallest deserts of Europe - Pobiti Kamani, Bulgaria.
Submitted on 14 February 2019
Credit: Dan Valentin Palcu (distributed via imaggeo.egu.eu)
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