Fierce NFL rivalries: 12 super-charged matchups

Bears and Packers clash in NFL's oldest rivalry

Ravens and Steelers battle for the north

Bad blood flows between Patriots and Jets

Chiefs and Raiders clash out west

Seahawks and 49ers are new-school foes

No love is lost between Dallas and Washington

Vikings crowd in on Packer territory

Superstar passers fuel Colts-Patriots matchups

Denver and Oakland don't pretend to like each other

Giants and Eagles rivalry built on long history

Deep south pride defines Falcons-Saints series

Dynasties collide as Cowboys and 49ers clash.