It is a prehistoric monument located in the county of Wiltshire, near Amesbury and Salisbury. The Stonehenge is believed to be built anywhere between from 3000 BC to 2000 BC. It consists of large standing stones within earthworks, at the center of many other Neolithic and Bronze Age monuments. 
Lara is invited to visit the Stonehenge in England by Madelynn "Maddie" Livingston because a mysterious Crystal Dagger has been found underground during roadworks. But after finding the Crystal Dagger it's taken away by force from Lara by Livingston's assistant, Trevor Doyle. Then a series of brutal murders begins and they appear to be part of human sacrifice.
- http://en.wikipedia.org/wiki/Stonehenge Retrieved on 6th Sep 2012