Kos has a wide and spacious feel. It holds an astonishing variety of remains from all periods of its long and important history. The town's skyline is exotically punctuated by minarets left by the Ottoman occupation and giant palm-trees left by the Italians. The most famous medical centre of Later Antiquity, in memory of Hippocrates whose name is inseparable from the island, lies close to the town and the island also has a large number of Early Christian churches. Nisyros is the most significant volcano in the Aegean after Santorini: its circular perimeter, deep central crater, rich dark earth and several hot springs leave no doubt as to its recent geological origins. The bubbling fumaroles, vapour seams and sulphurous efflorescences of the different craters are fascinating to expert and amateur alike. Pserimos is naturally one of the most tranquil corners of the Dodecanese, with a beautiful coastline and an undisturbed landscape of rocks and herbs and goats.