Here’s some good movies in each decade which are classics:

1930s: Modern Times

1940s: Double Indemnity

1950s: Vertigo

1960s: Bonnie and Clyde

1970s: Alien

1980s: Bill & Ted’s Excellent Adventure

1990s: Edward Sissorhands

Parallels (2015)was a pretty good movie, but was originally going to be a TV series. There was a lot of setup that was never paid off because of this, but it’s still a pretty good Sci Fi movie, just ends on a cliff hanger. Wish they made the series.