Theories about Stonehenge have historically tended to regard it as a stand-alone monument. But an increasingly well-supported view holds that Stonehenge was just part of a much larger ceremonial landscape, as this article in the March issue of Scientific American explains. Cutting-edge tools such as magnetometers, ground-penetrating radar and video game technology are helping archaeologists to detect and map other structures in the vicinity of Stonehenge and to understand how they relate to the great stone circle. In this video, archaeologists at the University of Birmingham in England discuss how these technologies recently led to the discovery of what seem to be remains of a giant ring of timber posts that overlooked Stonehenge.