Classics? Oh my... what about 12 Angry Men? It's the single oldest movie I have ever watched (1957) and it was surprisingly entertaining.
Or maybe some happy holocaust story? then watch La vita è bella, it's pretty good I guess.
There are also Goodfellas,
Dark Knight trilogy, Inception (me very like Nolan's movies),
No Country For Old Men,
Waterloo and Zulu for all the muskets and line battles fanatics
and probably many more but I can't think of anything more at this moment.