Craigengelt [estate].. includes a considerable mass of the Lennox Hills, and contains a circular cairn or mound called the Ghost’s Knowe, which, 300 feet in circumference, is engirt by twelve very large stones. This is one only out of several artificial mounds, clothed with fine grass, and called the Sunny Hills; and Craigengelt is believed to have been, in olden times, the scene of many tragical events.
(From Francis Groome’s Ordnance Gazetteer of Scotland (1882-4), an excerpt here).