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There are several day trips available to the Treshnish Isles and Staffa by boat. Fingal's Cave is the inspiration for Mendelssohn's overture 'The Hebrides'. Sixty million years ago, lava flowed from volcanic eruptions on Mull, creating Staffa and the Treshnish Isles. That molten rock started to cool down really quickly. The best way to lose heat if you're a rock is to produce cracks - which is what gave rise to the wonderful hexagonal pillars. Round pillars would create gaps between them, which is difficult but interlocking hexagonal columns help disperse the thermal energy. The large columns cooled more slowly than the thin columns and some are bent because they were still moving as they lost heat. The highlight of the island is Fingal's Cave. This is wild and romantic geology - a natural wonder that has to be one of the top ten 'must sees' in the British Isles.