'Stonehenge was to be a place where local merchants and tradesmen could gather, in order to peddle their wares and services to the thousands of Bronze Age tribes people who occupied Salisbury Plain at the time'. The document includes a plan, which shows that originally 600 stalls were to be constructed over a 200 acre site that would have also boasted ample grazing for 3500 Oxen and cart. ‘Stonehenge was essentially going to be the world’s first out of town shopping centre,’ said Dr. Bogaard.Actually they do think that stone circles were used for trade and politics as well as ritual, so it's not as far-fetched as it sounds. For instance, Arbor Low is located at the meeting point of the boundaries of three tribal lands - so could well have been used for trade and negotiation. Just as churches were used as sanctuaries from the law, a stone circle could have been neutral territory because of its sacredness.
I did like the idea of druids as pharmacists, as well.
Hat-tip to Cariadwen.