Photo by @shonephoto (Robbie Shone) - At 304m (1000ft) deep, and 1150m (3772ft) long, Grotta dei Tre Livelli (Cave of the Three Levels) is the longest lava tube on Mount Etna, here in Sicily. Although the name of the cave suggests there are three levels, the cave actually has at least five levels. Shot last week, this picture captures the view through a hole in the roof of the lower level up into another one above.
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