Historically significant films
Battleship Potemkin (1925) directed by Sergei Einstein. I would class tis film as a historically significant film because it changed how films are made.
The Seventh Samurai (1954) directed by Akira Kurosawa. I believe this is a historically significant film because the story has served as inspiration for many great films.
The Wizard of Oz (1939) directed by Victor Fleming.
Once Upon a Time in the West (1968) directed by Sergio Leone
mainstream films
A Bugs Life (1998) directed by John Lasseter.
The Breakfast Club (1985) directed by John Hughes.
Deadpool 2 (2018) directed by David Leitch
Love, Simon (2018) directed by Greg Birlanti
Toy Story (1995) directed by John Lasseter.
Art film
Submarine (2010) directed by Richard Ayoade.
Fitzcarraldo (1982) directed by Werner Herzog.
Alphaville (1965) directed by Jean – Luc Godard.
Manhattan (1979) directed by Woody Allen