Some people think that Colombo's achievement was to "discover" a "new" continent. However his real achievement was to show and teach us that the earth is a globe and not flat, as was thought and insisted upon, throughout the retarded and supersticious Dark Ages in Europe.
The "discovery" of this "new" continent was actually no more than a mere coincidence due to miscalculation. Besides, he was not the first at all; Asians, Vikings and maybe even "Atlanticians" had already found it long before him. Some may argue that for the world, it might have been better if it would not have been re-discovered at all.