A lost city reveals the grandeur of medieval African civilization

Some of the world's greatest cities during the Middle Ages were on the eastern coast of Africa. Their ornate stone domes and soaring walls, made with ocean corals and painted a brilliant white, were wonders to the traders that visited them from Asia, the Middle East, and Europe. They were the superpowers of the… » 2/20/14 5:52pm 2/20/14 5:52pm