I. On Salisbury Plain in Southern England stands Stonehenge, the most famous of all megalithic sites. Stonehenge is unique among the monuments of the ancient world. Isolated on a windswept plain, built by a people with no written language, Stonehenge challenges our imagination. The impressive stone circle stands near the top of a gently sloping hill on Salisbury Plain about thirty miles from the English Channel. The stones are visible over the hills for a mile or two in every direction. Stonehenge is one of over fifty thousand prehistoric "megalithics" in Europe. As Stonehenge is approached, the forty giant stones seem to