One film I love is the 1973 version of "The Three Musketeers" with a great cast that includes Oliver Reed, Charlton Heston, Raquel Welch, Faye Dunaway, Richard Chamberlain, Frank Finlay, Michael York, Christopher Lee. It runs between almost a Mel Brooks comedy and deadly adventure in political intrgue. The actors made the film unaware that they were also making the sequel "The Four Musketeers", which it seems the director and producer failed to tell them, and they were only paid for one film having to fight to be paid for the second. I'm not sure if they ever were paid separately for the latter.
Of course I love historically based epics.
The storyline of "The Fall of the Roman Empire" 1964 with Sophia Loren, Stephen Boyd, Alec Guinness, James Mason, Christopher Plummer, Mel Ferrer, Omar Sharif is the basis of the much later "Gladiator" with much more emphasis on the decadence and intrigue of Roman politics than Gladiator with all of it's superman-like arena fights. I thought Christopher Plummer was excellent as the megalomaniac Emperor Commodus, outshining Joaquin Phoenix in the role.
"Lawrence of Arabia 1962" is definitely one of the best films ever made. it's bewildering how Peter O'Toole did not win Best Actor versus Gregory Peck in the excellent "To Kill A Mockingbird", though I like both.
I also loved the version of The Three Musketeers that you mentionned. I saw it only once, and later bought the DVD. I still haven't opened that DVD. The original version of The Three Musketeers that is my favorite is the one with Gene Kelly in the role of D'Artagnan, with Van Hefflin as Athos. The later version with Charlie Sheen and Kieffer Sutherland was also very well done.
I found "To Kill A Mockingbird" somewhat boring. I never really got the fascination with this movie. I've never really been a big Gregory Peck fan. However, i did like him very much in 'The Omen", "Roman Holiday" and "The Boys from Brazil", which i also consider to be classics.
As for "The Fall of the Roman Empire", i saw parts of it a few years ago....i had actually seen it when i was a kid, but didn't remember it much. What struck me about seeing it again was the fact that i realized (as you mentionned) that the storyline of the Oscar-winning movie "Gladiator" was nearly similar to that movie, with the same characters & all.
As for "Lawrence of Arabia", it remainds to this day one of my favorite classics. I'll admit that the movie is a bit long, but it had to be. The cinematography is breathtaking and Peter O'Toole is at his very best. Definitely one of David Lean's many masterpieces!!