S2·E159 Peabody's Improbable History - Christopher Columbus
Aired January 12, 1961
Synopsis
Mr. Peabody and Sherman help Christopher Columbus discover that the earth is round.
TRIVIA: It is a popular misconception that Columbus discovered America or that the Earth was round. The Earth’s shape had been common knowledge for centuries and Columbus was actually a terrible person who nearly drove the Caribbean natives to extinction.
Also, Columbus was the first European contact with the Caribbean, Central America, and South America - not North America as this episode suggests.