The Deepdale Stone
This single standing stone is nearly 2 metres high, embedded on high ground to the west of the road and directly opposite Stenness Loch. The stone was once one of a pair, but unfortunately nothing has survived of its partner. The missing stone, thought to have been slightly taller, was removed sometime between the 1940s and the 1970s; it had become unstable after many years of ploughing. Later excavations revealed the location of the socket hole.
Various theories have been proposed as to the stone's connection to other monuments - alignments with the Ring of Brodgar, or the tomb at Unstan, have been suggested.