The Ten Commandments is one of my favorites. I try to watch it every few years when they play it before Easter. Yul Brenner is just too cool.
I saw The Agony and the Ecstasy with Rex Harrison and Charlton Heston once, it was great. I would love to see that movie again.
Of course, I can't forget to mention Ben Hur. Hmm, I seem to have a thing for Charlton Heston movies
