On June 4, 1989, Chinese tanks rolled into Beijing's Tiananmen Square to crush a student-led protest movement calling for greater political freedom. To this day, the death toll remains in dispute, but it is believed thousands may have been killed.
CBS News' senior foreign correspondent Elizabeth Palmer returned to Tiananmen Square 30 years later, to find its bloody history erased by modern China.
Wu'er Kaixi, who at the time was 21 and was one of the main student leaders of the protests, managed to escape the violence.
"I am the survivor of a massacre," he told Palmer. "I have to live with the guilt."
Although he and the students knew the government was threatened by demands for reform, he said, he thought there was "no way" it would come to "real ammunition and tanks rolling over people."
"You never dreamed it would come to that?" Palmer asked.
"No, no, no, no," he responded.