In the last years of the 19th century John Stuart McCaig decided to erect a monument on a hill overlooking Oban. Whilst a pillar of the local community, McCaig did not choose a column or obelisk, but instead a colossal circular wall, pierced with gothic windows, giving magnificent views of the harbour and out to sea.
Islay House was known as Kilarrow House until the middle of the eighteenth century. It was given its new name by Donald Campbell the Younger after he remodelled the house in the 1760s. Four lookout towers were built on the island, and the two known simply as the East and West towers, survive today in the park.