The chariot race required 15,000 extras on a set constructed on 18 acres of backlot at Cinecitta Studios outside Rome. Tour buses visited the set every hour. Eighteen chariots were built, with half being used for practice. The race took five weeks to film.
During the 18-day auction of MGM props, costumes and memorabilia that took place in May 1970 when new studio owner Kirk Kerkorian was liquidating the studio's assets, a Sacramento restaurateur paid $4,000 for a chariot used in the film. Three years later, during the energy crisis, he was arrested for driving the chariot on the highway.
The production cost MGM a massive $15 million, and was a gamble by the studio to save itself from bankruptcy. The gamble paid off, with the film earning $75 million.
Kirk Douglas was offered the role of Messala but turned it down, because he didn't want to play a "second-rate baddie". Douglas wanted to play Judah Ben-Hur, whose Jewishness appealed to him, but he was too old and Charlton Heston had already been cast. The experience motivated Douglas to develop his own epic, Spartacus (1960), which was partially designed to compete against this film.
The desert sequences were all set to be filmed in Libya until authorities in the country--a Muslim nation--realized that the film was promoting Christianity. The government ordered MGM out of the country, forcing the studio to shift filming to Spain, which has the only desert in Europe.
May McAvoy: Esther from the original Ben-Hur A Tale of the Christ (1925) is the only member of the original MGM film to appear in this film as well. She's an extra in a crowd scene.