Where did Christopher Columbus explore during the late 1400s?

Christopher Columbus explored the eastern coast of North America during the late 1400's. He was also one person to sail northwest to look for the North West Passage. Many ships sailed that way, but only he got far enough to find out that there was no North West Passage.

and that is where he planed revenge on all his school recipiants whom ofwich sayed he is worthless and could not sail that fall with out being killed.