Seoul, South Korea, in 1973
Over the course of five days in Seoul, South Korea, Billy Graham held what might be his largest crusade during his public career, with approximately 3.2 million people attending.
On June 3, 1973, his final day in the country, Graham preached to an estimated 1.1 million people with a Korean preacher named Billy Kim serving as interpreter.
In his authorized biography on Graham, John Pollock wrote that the large crowd present would have made it "easy to trigger a mass reaction."
"He therefore made his invitation harder than usual. 'If you're willing to forsake all other gods, stand up,'" wrote Pollock.
"There was a hush upon the audience at first. Then one here and one there arose, until thousands were standing. Billy led them in the prayer of accepting Christ. ...Then he said, 'counselors with your material, make your way back to those people who are standing.' Over 12,000 cards came in that day. Thousands more followed by mail ..."