Please help me expand this list:
Tarkovsky:
Stalker
Solaris
Sacrifice
Nostalghia
Parajanov:
Sayat Nova
Tati:
Play Time
Mon Oncle
Tarr:
Satantango
Karhozat
Kwaidan
Aguirre:Wrath of God
2001 Space Oddysey
Much appreciated!!
L'année dernière à Marienbad
Modern Times
Die Kinder vom Bahnhof Zoo
28 days later (yes, I really mean that)
Citizen Kane
The Brothers Grimm
Apocalypse Now
Nosferatu
Vidocq
Un chien andalou
Edit: Although morally more than questionable, consider the complete work of Leni Riefenstahl.
the great extasy of the wodcarver (sculptor) stiener
The man with the movie camera
Crouching Tiger Hidden dragon
Trafic (tati)
Hamlet (Olivier)
black and white movies were better
Suspiria (Argento)
All That Heaven Allows (Sirk)
Amelie
Picnic at Hanging Rock (Weir)
Onibaba
The Conformist
The Company of Wolves
Fanny and Alexander (Bergman)
Paris, Texas (Wenders)
Juliet of the Spirits + Satyricon (Fellini)
Koyaanisqatsi
Baraka
La Cite de les Enfants Perdeux
Blade Runner (dark, but still gorgeous)
Le Mépris
Cinema Paradiso
Anything where Wong Kar Wai worked with Christopher Doyle. Mostly Chungking Express, Fallen Angels, In the Mood for Love and especially 2046.
Lars von Trier's Antichrist. Seriously. Just look at the trailer, every single frame could be in an art gallery.
I think Seul Contre Tous by Gaspar Noé could qualify too, though it's an ugly kind of beauty. Perhaps Enter the Void as well.
You could mention any Kubrick movie. Barry Lyndon, A Clockwork Orange, Eyes Wide Shut, ...
The Innocents (1961)
House (1977)
Brazil (1985)
Edward Scissorhands (1990)
Leon (1994)
The 12 Monkeys (1995)
Any Jean-Pierre Jeunet movie.
Any Emir Kusturica movie.
Any Ingmar Bergman movie.
I could second a lot already mentioned. Instead I will add a few movies that I have been tempted to mute and/or pause and just enjoy visually.
What Dreams May Come (1998) -- very very lush and beautiful
Fantasia (1940)
Jesus of Nazareth (1977) -- directed by Franco Zeffirelli, see it on a decent color display
A Midsummer's Night Dream (1935) -- black and white, but goes as far as one can go. Won an Oscar for the lighting, the ONLY Oscar ever given to a write-in candidate. (By the way, Hitler hated it and banned it from Germany.) On a clear screen, the special effects and lighting is magical.
Gattacca (1997)
Sleeping Beauty (1959) -- Disney
V for Vendetta (2005)
Batman (1989) ... What these three have in common is that they have bright colors, visually engaging, but although that's like comic books (like that Dick Tracy (1990) movie), they use the colors masterfully to produce some gorgeous art ... one would like to have a large print of a frame on the wall. Sleeping Beauty uses an incredibly flavorful palatte.
The Godfather (1972)
Manhattan
Metropolis
Days of Heaven
Raise the Red Lantern
To Live
Just to add a few more...
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The Naked Island
Lawrence of Arabia
Thief
Anything by Powell and Pressburger
"Some men are coming to kill us. We're gonna kill them first."