Mythical Ireland | Ancient Sites | 101 Facts about Newgrange
Nov 08, 2017· 43. The Great Circle (GC) has an average diameter of 103.6m (340 ft), which is larger than the diameter of Stonehenge, the outer bank of which is 97.5m (320 ft). 44. The stones of the GC consist of greywacke, which is a type of sandstone, as well as limestone, granite and other igneous rocks and stand at a height of approximately 2 metres each. 45.