"The mystery surrounding Stonehenge has suddenly deepened -- literally. A first-of-its-kind study suggests that 15 previously undiscovered or poorly understood monuments lie hidden under the ancient stone monument and its surroundings.'
http://www.huffingtonpost.com/2014/08/25/new-study-buried-structures-stonehenge_n_5709137.html
http://www.huffingtonpost.com/2014/08/25/new-study-buried-structures-stonehenge_n_5709137.html