Fingal's Cave a walkway just above high-water level permitting exploration on foot. From the inside, the entrance seems to frame the island of Iona across the water. Romantic composer Felix Mendelssohn visited in 1829 and wrote an overture, "The Hebrides", Op. 26, (also known as "Fingal's Cave overture"), inspired by the weird echoes in the cave. Mendelssohn's overture popularized the cave as a tourist destination. Other famous 19th-century visitors included author Jules Verne, who used it in his book "Le Rayon Vert" ("The Green Ray"), and mentions it in the novels "Journey to the Center of the Earth" and "The Mysterious Island";
Inner Hebrides oyster are also found, in for example, the Sound of Scalpay. There are nationally important horse mussel and brittlestar beds in the sea lochs. Heather moor containing ling, bell heather, cross-leaved heath, bog myrtle and fescues is abundant and there is a diversity of arctic and alpine plants including alpine pearlwort and mossy cyphal. Inner Hebrides The Inner Hebrides (; Scottish Gaelic: "Na h-Eileanan a-staigh", "the inner isles") is an archipelago off the west coast of mainland Scotland, to the south east of the Outer Hebrides. Together these two island chains form the Hebrides, which experience a mild oceanic climate.