I will go with ones that perhaps haven't been mentioned so far, or are less often suggested.
Seven Samurai, which I don't believe was mentioned with other Kurosawa films earlier. Also Throne Of Blood, particularly the end sequence with the hails of arrows.
I am a big fan of a scene in My Darling Clementine, where they have Wyatt Earp talking to two men under a canopy/awning. No incidental music or anything, steady shot, with the pouring rain playing under it the whole time. The rest of the film is pretty beautiful too, from what I remember.
Spielberg has been mentioned a bunch, I nominate Duel, considering how little budget and experience he had at the time.
Alien comes to mind as well, gorgeous and still scary film to this day, especially if you watch it in the dark (although the strobe lighting towards the end doesn't half hurt your eyes!)
Then you have big musicals like Singin' In The Rain, American In Paris and, one of my favourites, Footlight Parade. All the old school Busby Berkeley choreography.
I would also put forward some of Jackie Chan's works, the choreography and stunt work is phenomenal, plus all the slapstick influence from Chaplin, Keaton and the like.
An aside as well, I recommend looking up Breadsword on YouTube, was reminded after someone mentioned Dr Strangelove earlier, he does a very good video essay on that film, as well as one on The Life Aquatic With Steve Zissou, which is another damn fine looking film from Wes Anderson.