 , a fortress built in the late 15th century near Kyleakin and once a seat of Clan MacKinnon, is another ruin.In the late 18th century the harvesting of kelp became a significant activity but from 1822 on cheap imports led to a collapse of this industry throughout the Hebrides.During the 19th century, the inhabitants of Skye were also devastated by famine and Clearances.