Located a mile (1.5 km) south of Muirkirk and a half-mile (0.8 km) south of Kames in East Ayrshire, MacAdam's Stone (or MacAdam's Cairn) is a memorial to John Loudon MacAdam (1756 - 1836), who ran the Tar Works in Muirkirk and developed the process of 'macadamisation' which gave a robust surface for roads for the first time.