With the click of a mouse, archaeologist Vince Gaffney proudly summons up a vision of an ancient landscape. Amid the clutter of his office at the University of Birmingham in England, the 52-year-old professor of landscape archaeology is displaying early results of a virtual excavation at Britain’s best-known prehistoric monument. On the screen: a giant ring of wood posts that may have stood roughly 1,000 yards northwest of Stonehenge, a timber twin of its grander neighbor. In 2010 Gaffney began a three-year project heading an international team that will probe the surrounding countryside in one more attempt to unravel the site’s mysteries, this time with the aid of the very latest technology. The first reward came quickly. Within just two weeks the team, armed with high-powered magnetometers and ground-penetrating radar, discovered traces of that putative timber ring—possibly the most important find on the site in half a century.