Culzean Castle on the Ayrshire coast is the most visited property of the National Trust for Scotland. Built in the late sixteenth century above a network of caves, the castle became a centre for smuggling during the eighteenth century. Sir Thomas Kennedy, 9th Earl of Cassillis, went on an extended grand tour in the 1750s and returned full of ideas as to how to improve his vast estates and home. His brother and heir commissioned Robert Adam to create his masterpiece and became bankrupt as a result. The estate was rescued when wealthy American cousins inherited it in 1792.