What was the age of exploration?

"Before the fifteenth century, European sailors were unsure what waited for them beyond their well-known travel routes around the Mediterranean Sea, so they kept within sight of land. But all of that changed after Prince Henry the Navigator of Portugal started sending ships down the coast in the hope of finding a sea route to India and Africa. This was the beginning of a giant leap toward understanding what the globe actually looked like. Certain European nations grew rich and powerful from the New World gold and lands they claimed, while advanced, long-standing civilizations like the Aztecs and Incas were destroyed in the cruelest of ways"--