For thousands of years the major civilizations of the world thrived in isolation from one another. These civilizations had very little contact with one another, and in many cases had no knowledge of each other.
This all began to change during the Dark Ages. Both Western Europe and China began to send out explorers in an effort to learn about the world around them. These explorers helped to expand the knowledge of their people.
As a result of their explorations, trade routes opened up between civilizations. Each nation specialized in certain types of products and goods. These goods would be shipped to far away nations in exchange for the goods that they specialized in.
One ship drives east and another drives west with the selfsame winds that blow. Tis the set of the sails and not the gales that tell us the way to go.
Like the winds of the sea are the ways of fate. As we voyage along through life, Tis the set of the soul that decides its goal, and not the calm or the strife.
Ella Wheeler Wilcox
The oldest man-made structure still existing is the central edifice of the 4,600-year-old tomb built at Sakkara, Egypt.