Photo by @shonephoto (Robbie Shone) - A photograph from last week revealing the striking roof inside Sicily's longest lava tube, known as Grotta dei Tre Livelli (Cave of the Three Levels), showing the movement and orientation of the flow of lava. Located on the southern slopes of Mount Etna, the age of this lava tube is exactly known and can be traced back to when the lava flow occurred in 1792-93.
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