A low-key example would be the scene where Judah and Messala toss spears at a rafter beam and nail it.
Jesus giving Judah the water. The Roman decurion yells at him to stop, and he keeps pouring it for Judah without so much as flinching. When the decurion gets angry and steps forward, Jesus stands up tall and silently looks the man in the eye. The decurion goes from anger to confusion to sheepishness to guilt, then simply backs off. The decurion naturally doesn't comprehend that he's facing the son of God, but he perceives there's something about this man that's way beyond his authority.
The naval battle between the Romans and the Macedonians.
"You can't make miniature water. And you sure can't make miniature fire" espoused special effects artist A. Arnold "Buddy" Gillespie in his memoirs. He went on to prove himself wrong on this one.
Judah's escape from the galley, freeing many other slaves in the process, protecting Quintus Arrius with his spear-throwing skills, shoving a torch in the face of a Macedonian soldier and diving in the water to save Arrius' life.
The old servant Simonides was tortured for years by the Romans, to the point where he can't even walk when Judah finally returns, and still didn't give up the location of Judah's family fortune.
Judah's dramatic boast, "I told you I would return," and his demanding of Messala to find his family or else. This man has just come back from a certifiable death sentence — he shouldn't have even survived the trek to the boat! — so if he swears vengeance on you, not even the whole Roman Empire can help you (especially when he comes back the favored son of a Roman superior).
The bigChariot Race, which doubles as a revenge showdown between Judah and Messala. Expertly staged with every edit, every stunt, every close-up detailing the hatred and bloodlust the two characters have against each other. Still considered one of the greatest action sequences in film history.
Even the 1994 pan-and-scan VHS of this movie reverted to the Letterbox screen just so this sequence can retain its impact (the 1983 pan-and-scan Laserdisc cropped this scene as well)
The 'Miracle' sequence, right after the Christ's death on the cross. A thunderstorm erupts, forcing Judah's leprosy-stricken sister and mother to seek shelter in a cave. Amidst torrential rain and repeated lightening strikes, they suddenly realize their affliction has disappeared. As the music swells, cut to montage of Christ's blood flowing to the base of the cross and being carried overland by rain-swollen streams, symbolically cleansing the world.
