NASA / SCIENCE PHOTO LIBRARY NASA / SCIENCE PHOTO LIBRARY
Santorini, Greece, seen from the International Space Station (ISS). This ring marked the what was once a volcanic cone making a single island. Santorini (now several islands) is what remains after an enormous volcanic eruption in around 1600-27 BC destroyed most of the island. Water from the Aegean Sea rushed in to fill the resulting caldera, forming a 12 kilometre-long lagoon. At the centre of the lagoon is Nea Kameni, the latest volcano to form at this site. Photographed on 3 September 2016.
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