Steep coastlines and vast beaches make up the geology of Santorini, a stunningly beautiful Greek island that forms part of the Cyclades group. Over the past few years, Santorini holidays have developed into an upmarket experience as hotels have become ever more luxurious. The island was originally formed from one of the largest volcanic eruptions in the world – meaning Santorini is essentially a submerged volcano and a caldera. Amazing views over the caldera are possible from the villages of Fira and Oia, as both are perched on cliff tops and look down over the black and red beaches – the perfect vantage point for sensational sunsets, many of which have been photographed to lend further fame to this delightful scenic island.