An Iron Age fort on the summit of the hill about 60m in diameter. Traces of the rampart and ditch still exist and that of the entrance. A winding approach is also visible. Hillforts such as this were primarily defensive structures. But they were also a symbol of power, demonstrating the local chief's importance. They also became places of trade and metalworking bringing wealth to the area.
The hillfort also gives its name to a part of Largs below it called Castlebay.
The photograph below shows Cock-ma-Lane with Castle Hill above.
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