Me and my brother like playing card games?

Ok, so me and my brother have a deck of cards, 52 with king queen jack ace etc. What are some good games we can play? We already play crazy 8s and go fish but it’s boring just playing those two over and over again. Do you know any other good ones? We don’t bet any money by the way. And I tried rummy, i didn’t have much fun playing.

I’m going to be doing a lot of traveling next year so it’s my goal this summer to learn a lot of new card games to play with the group I’m traveling with. Card games as in ones you can play with a standard 52 deck (or the ones you play with multiple standard decks). Which are the best card games to know? What are the "classics"? Beyond "Go Fish" please :)

Can anyone recommend any good card games?

My friends and I tend to play a ton of card game at school during lunch. Since we’re on Christmas break, I think it would be a good time to think of a different card game to play at school. In 2 weeks I can easily learn something else and teach it to everyone after break is over.

Here’s a list of games we frequently play:
Mao
Egyptian Rat-Screw
Go Fish
Blackjack
Speed
California Speed
War

Any other good ones anyone has in mind?