Photograph by Ken Geiger, National Geographic Staff

Stonehenge, on Salisbury Plain, is arguably England's greatest archaeological treasure. Though weathered and broken, its ruins are a window on a prehistoric world, guarding secrets after more than 4,500 years. Here, lights from the nearby town of Amesbury lend a lavender glow to the sky above the enigmatic monument.

(This photo is from "If the Stones Could Speak" in the June 2008 issue of National Geographic.)