The archaeologists used a variety of techniques, including radiocarbon dating on workers' campfires from millennia ago, to discover that holes cut into rocky outcrops to gather the stones were made centuries before Stonehenge was built.
At least that's the theory proposed by some historians - including Pearson, who suggested in a 2012 book that the construction of the monument could have been a show of unity.
At the time of Stonehenge's creation, the wheel had not even been built - modern tests have shown it is possible to move stones of similar size on rolling logs or sleighs, but the most archaeologists can do is make an educated guess.
Alternatively, they could have a read Erich von Däniken's seminal book , which makes the argument that many ancient megastructures such as Stonehenge, the Egyptian pyramids, and the Moai heads of Easter Island were built using know-how passed down from God-like aliens to mankind.
Near the centre of the monument, there is a horseshoe-shaped opening that faces northeast - suggesting the designers of the monument wanted it to align with the points of sunrise and sunset during the winter solstice.
Radiocarbon dating on animal remains found near Stonehenge revealed that pigs were slaughtered either in December or January every year, suggesting an annual ritual around the time of the equinox.
From within these enigmatic mounds some of the finest artifacts have been unearthed.
They are the archaeological Holy Grail to understanding the spirituality and daily life of a culture long gone.
Round mounds are plentiful in and around the Plain, some of which housed burials, although not all are so easily explained.
One fascinating find came from a Plain barrow that was excavated in 1955. Initially, a blanket explanation was given – the skull had been trepanned.
According to some, the shapes and sizes of the rocks make for excellent acoustics - enhancing and amplifying the sounds of instruments and voices, and even creating some odd audio illusions, all of which could have been used in celebrations or rituals.
After a 2012 study into Stonehenge's acoustics, Bruno Fadenza, a Salford University researcher, told that ancient people would have "perceived the sound environment around them changing in some way" as they entered Stonehenge, experiencing a similar odd sensation that we do today when entering cathedrals.
Bronze Age (c2500-750 BC orthodox dating) burial goods, such as jet from the Baltic, beads form Egypt and delicate and intricately designed gold artifacts reveal international trade and artistic craftsmanship.