Stonehenge – the prehistoric circle of 13-foot-tall stones in Wiltshire – is the source of some of the world’s greatest mysteries.
Historians believe the monument was built about 5,000 years ago, but the reason for it remains unconfirmed.
Indeed, the massive rocks weigh upwards of several tonnes each, so how Neolithic Britons were able to hurl them to Salisbury Plain and arrange them has been long-debated.
MailOnline takes a look at the five biggest remaining mysteries about Stonehenge, and looks