What is the most visually stunning film of all time?

I just bought a 58 inch 4k tv and it's by far the most visually stunning thing I've seen outside of a theater. Every week I watch a new film and want to take full advantage of my new beauty. Genre doesn't matter as I've liked films in any genre, though I would prefer it not be more than 2 and a half hours long. Would love to hear suggestions.