Choeung Ek, 9 miles from Phnom Penh, is the best-known of the sites known as The Killing Fields. From 1975 to 1979, the Democratic Kampuchea regime was responsible for a state-sponsored genocide where millions of people were executed and buried in mass graves. It’s estimated that 25% of the population died from executions, disease, and starvation. In 1979 Vietnam liberated the people from the homicidal regime, putting an end to the executions. My visit to The Killing Fields was the most sobering day of the trip.