A wildlife trail in the Bhondsi stretch of the Aravallis near Gurugram, Haryana, has led researchers to a cluster of prehistoric petroglyphs, cupules and Stone Age tools, now being documented by the ASI and the state archaeology department. The find is in the news for showing a rare "chronological continuity" of human activity in the Aravallis and for the threat it faces from the land mafia. This article explains what petroglyphs and cupules are, the Palaeolithic-to-Mesolithic chronology, the Acheulean tool tradition, comparisons with Bhimbetka and other rock-art sites, and the legal framework for protecting India's heritage тАФ all mapped to the UPSC Prelims and Mains syllabus.