Stonehenge stands alone in the vast empty tract of Salisbury plain. Its origins date back nearly 5,000 years and been home to pagan religious practice and spiritual worship, and vast public debate. What was this vast collection of stones intended for? Was it an observatory of the moon, a temple to the sun, or an elaborate cemetery? Who were the people who carried and carved these 40 tonne rocks? Unlock the secrets of this remarkable and mysterious feat of ancient engineering.