According to the BBC, the archaeologists
...believe that the bluestones, which were transported 250km (150 miles) from the Preseli Hills in Wales to the Salisbury Plain in Wiltshire, were brought to the site because the ancient people believed they had healing properties. Professor Geoffrey Wainwright said the site could have been a "Neolithic Lourdes"....As well as reaching the bluestone sockets, the archaeologists have also unearthed a whole host of other finds.
