Sligo's ultimate rock pile sits atop a magical mountain hike. Knocknarea Cairn is popularly believed to be the grave of legendary Queen Maeve (Queen Mab in Welsh and English folk tales). The 40,000 tonnes of stone have never been excavated, despite speculation that a tomb on the scale of the one at Newgrange lies buried below. The site is 2km northwest of Carrowmore. The parking area is off the R292.