Here's a non-genre specific list of films, many of which are lesser-known, that are worth watching too:

Snowpiercer

The Legend of Sleepy Hollow

Ladies and Gentlemen, the Fabulous Stains

Black Snake Moan

Over the Edge

One Flew Over the Cuckoo's Nest

The Night the Lights Went Out in Georgia

Lawn Dogs

Days of Heaven

Cold Comfort

The Book of Love

The Light Between Oceans

Barefoot

The Giver

Time Freak

The Journey of Natty Gann

Apocalypto

Joe