The Keep (1983)

The Keep is a really frustrating movie, because with a little more work it could have been a classic. The characters--and especially their relationships--in the movie are severely underdeveloped, but are also pretty important to the plot. The whole story feels pretty skeletal, but it's so great visually and the concept is interesting. It's basically about Nazis being jerks, and a cool-looking Golem-like monster that may or may not be able to fight them.

Best of all is the soundtrack by Tangerine Dream. Below you will find what is probably the most famous scene in The Keep. It's just some Nazis trying to steal silver, but the music and everything makes it seem like a unicorn is about to leap out of the wall.