Stalker | FULL MOVIE | Directed by Andrey Tarkovsky

A guide leads a writer and a scientist into the Zone, a sealed-off region rumoured to contain a room that grants a visitor's deepest wish, and the three argue their way toward it more than they walk. Andrei Tarkovsky turns a science-fiction premise into a long argument about faith, desire and what people actually want.

Why it's free: Free on Mosfilm's own channel; Mosfilm holds the rights to the Soviet-era library it publishes.