books.google.ee - When Columbus was born in the mid-fifteenth century, Europe was isolated in many ways from the rest of the Old World and Europeans did not even know that the world of the Western Hemisphere existed. The voyages of Christopher Columbus opened a period of European exploration and empire building that breached...http://books.google.ee/books/about/The_Worlds_of_Christopher_Columbus.html?id=8jhtmzLlX70C&utm_source=gb-gplus-shareThe Worlds of Christopher Columbus
