Stonehenge was begun about 2800 B.C. by a people who had no written language, no wheeled vehicles, no draft animals, and no metal tools. To dig holes in the ground, they used the antlers of deer. The initial Stonehenge consisted of a circular embankment 350 feet (107 meters) in diameter, four marker stones set in a rectangle, some postholes, and the Heel Stone. The Heel Stone was apparently the first of the great boulders brought to this site as construction commenced. But it may not have stood alone. A similar huge stone stood just to its left as seen from the center of Stonehenge. In that ancient time, the Sun at the beginning of summer probably rose between the famed Heel Stone and its now-vanished companion, and the alignment with sunrise at the summer solstice was probably exact.