I feel so old. I've seen so many of the movies mentioned in a theater. :p I agree with I12, that nothing can replace watching a movie on the big screen. Some, especially "spectacles" like Ten Commandments, Titanic, West Side Story, and many others I can't think of right now, are great to see on the big screen the first time.
I did get to see GWTW back in the 70's when they played it at a local theater. The Wizard of Oz would be nice to see on the big screen, although I'm happy to say, both those movies are waaaaaaay before my time.
Although, I don't know that they'd be classified as "spectacles", I would have loved to see any of the James Dean movies on the big screen. It wasn't until they were televised that I saw them, and at that time, with no videos, you simply had to wait, and check your tv guide in order not to miss a good movie.
And in keeping with that era, a movie that's probably more of a "groundbreaker" than an award winner is "Rock Around The Clock." I remember my older brother coming home from the theater saying what a commotion, with people screaming, dancing in the aisles of the theater. With Rock & Roll, at it's birth, and being a fan at a very young age, I would have loved to witnessed the spectacle of the era, you might say.
TIS