The Stonehenge Riverside Project
Here is a Web site on the very recent work of professional archaeologists
studying Stonehenge:
http://www.shef.ac.uk/archaeology/research/stonehenge
To quote Professor Mike Parker Pearson, head of Stonehenge Riverside
Project:
"Stonehenge was a place of burial from its beginning to its zenith in the mid third
millennium B.C. The cremation burial dating to Stonehenge's sarsen stones phase is
likely just one of many from this later period of the monument's use and demonstrates
that it was still very much a domain of the dead."
There is a rather obscure rock band from the early 1980s which produced
its own theory on the ancient rock formation:
http://www.sing365.com/music/lyric.nsf/Stonehenge-lyrics-Spinal-Tap/C5BF21B1DBC24FA148256DCE002F45C7