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The earliest antiquarian reports stated that Newgrange had a fallen pillar-stone in the chamber, although no evidence has come to light since. Cairn L at Sliabh na Cailli has a pillar in its chamber, known as the Whispering Stone, and it is likely that the cairn was constructed around this special standing stone. The Whispering Stone is struck by a beam of light from the rising sun on the November and February cross-quarter days, a truly amazing sight to behold. Today the passage and chamber of Cairn F are completely caved in and choked with cairn material. The sight of this majestic structure left in such neglect presents a sad sight to the visitor. The passage and chamber are aligned due north across Cairn E, in the direction of the Deerpark monuments on the northern side of Lough Gill. This makes this Cairn F one of a small group of Irish cairns concerned with the pole star. This northern position marker was used to measure the angle of the lunar standstill to Knocknarea from Cairns E & K and the summer solstice sunsets at Cairns E & G. Another possible function is to observe the pole star at noon during solar eclipses.