In 1324 the emperor of Mali, Mansa Musa, began a legendary pilgrimage to Mecca that stunned the medieval world. Traveling with tens of thousands of followers and caravans of camels loaded with gold, ...

America has more billionaires than ever, led by Elon Musk, who's estimated to be worth $744.6 billion. Figures such as John D. Rockefeller and Andrew Carnegie were known as the richest men of their ...