I thought Kalymnos sounded familiar and when you mentioned Kos, it triggered my memory as I stayed there for 2 weeks many moons ago! Although we never went to Kalymnos, we went to another neighbouring island called Nissyros, which is an active volcano (if memory serves right). Pretty cool to walk in if you haven't had a chance to visit yet!
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Thanks for passing by @nickyhavey. Yes, I've been on Nissyros several times. I hope you also visited the small villages on the crater rim. It has a beautiful view of the crater. And you are right, this volcano is still active.