Tom & Jerry (Gene Deitch era) S01E03 - It's Greek to Me-ow!

This cartoon opens with a narrator (Allen Swift) introducing the Ancient Greek Acropolis, describing its wealth and beautiful architecture. However, the narrator reveals that on the other end of the Acropolis, people lived in poor conditions and housing. Tom is depicted as one of these inhabitants, an alley cat and a beggar, while Jerry is a rich mouse living in a luxurious hole.