Around 4,500 years ago, about the same time Egypt’s Sphinx and the Great Pyramid of Giza were underway, thousands of Europeans worked on England’s own mysterious monument: Stonehenge. The ceremonial formation that tourists visit today is actually the result of 1,500 years of labor and alteration. It all began when men transported blue volcanic rock in sledges from west Wales to Wiltshire, in Southern England—a 120-mile trip. Five hundred years later, the monument underwent a makeover: at least 1,000 men were enlisted to move the massive rocks 15 miles and to lift stones high up—researchers still aren’t sure how they did it—to make lintels. Featuring prehistoric stone axes, metal work, and jewelry, and sharing the latest archaeological insights, the British Museum sheds new light an on old enigma. —J.D.