Avebury megaliths - thanks to Postcrossing :)
A beautiful back of the postcard.
Stonehenge, Avebury and Associated Sites
Stonehenge and Avebury, in Wiltshire, are among the most
famous groups of megaliths in the world. The two sanctuaries consist of
circles of menhirs arranged in a pattern whose astronomical significance
is still being explored. These holy places and the nearby Neolithic
sites are an incomparable testimony to prehistoric times.