James Sturcke and Maev Kennedy report in The Guardian:
Archaeologists have discovered evidence of what they believe was
a second Stonehenge located a little more than a mile away from
the world-famous prehistoric monument. The new find on the west
bank of the river Avon has been called “Bluestonehenge”, after
the colour of the 25 Welsh stones of which it was once made up.
Excavations at the site have suggested there was once a stone
circle 10 metres in diameter and surrounded by a henge – a ditch
with an external bank, according to the project director,
Professor Mike Parker Pearson, of the University of Sheffield.
The stones at the site were removed thousands of years ago but
the sizes of the holes in which they stood indicate that this
was a circle of bluestones, brought from the Preseli mountains
of Wales, 150 miles away. The standing stones marked the end of
the avenue that leads from the river Avon to Stonehenge, a
1¾-mile long processional route constructed at the end of the
Stone Age.