What are some Must Watch Movies?

Hiya, so as the title states, if you were to recommend some movies, what would you suggest?

There are two that I can think of

1.) Bong Joon Ho collection

2.) Showa Era Godzilla (1954) - Ishiro Honda

3.) The vengeance Trilogy - Park Chan-Wook

I have seen these three and I thoroughly enjoyed them. What do you think I should add to the list as you will most likely have seen a lot more than me lol.