Offers insight into the historical events that prompted Columbus' efforts to establish new trade routes to the Indies, his struggles to obtain financial support for his voyages, and the important discoveries that caused him to become known as the "Great Admiral of the Seas."

Explains the importance of the contribution made by the Italian sailor and navigator Christopher Columbus, whose discovery of America in 1492 changed the geography of the known world.

John Wesley Powell always had the spirit of adventure in him. As a young man, he traveled all over the United States exploring. When the Civil War began, Powell went to fight for the Union, and even after he lost most of his right arm, he continued to fight until the war was over. In 1869, he embarked with the Colorado River Exploring Expedition-- ten men in four boats-- to float through the Grand Canyon. Ten explorers went in, but only six came out....