For me:
*
Snow White and the Seven Dwarfs (1937)
Disney's first full-length animated feature and still the best, IMO. Every frame is a masterpiece -- not just the animation, but also the beautiful background paintings. Preceding the use of airbrushed gouache, the paintings were done by the great Claude Coats in transparent watercolors... and they look magnificent, IMO.
*
The Mission (1986)
Okay, the message is perhaps objectionable (natives saved from themselves by Christianity, and all that), but both Jeremy Irons and Robert De Niro give good performances, the scenery is exquisite, Ennio Morricone's score is very affecting and the movie's finale is memorable. The waterfall sequences alone are worth multiple viewings, IMO.
* everything by stop-motion supremo
Ray Harryhausen(with the exception, perhaps, of Sinbad and the Eye of the Tiger (1977), which was rather dull and plodding).*
Robocop (1987)
Gleefully over-the-top violence that strays into dark comedy, winning score by Basil Poledouris, and superb stop-motion animation by Phil Tippett.
*
The Empire Strikes Back (1980)
Faraway the best of the
Star Wars movies.
*
Flash Gordon (1980)
The look of the sets and costumes and the psychedelic skies is absolutely unique... in a good way. The rock soundtrack by
Queen fits the movie perfectly.
*
Indiana Jones and the Temple of Doom (1984).
Many regard it as the worst of the series (or the second worst, after
Crystal Skull), but it's my favorite. Won a well-deserved Oscar for best visual FX. The rope bridge finale is, IMO, the single best action sequence in the entire series.
*
Pulp Fiction (1994).
Funny, absurd, violent, captivating.
On the more sombre side...
Saving Private Ryan (1998).
A masterpiece on multiple levels.