It's so old to go to Cambodia and come back. I haven't written any comment on the killing ground. Now I'm in the mood. I want to comment on it. The killing ground is a must for many tourists to go to Phnom Penh. It is about 15 kilometers away from Phnom Penh. I travel alone, so I hire a beeper. Tickets are $6. It's very important to give Chinese explanatory machine if you come from China without explaining it. The explanatory machine explains the whole murder scene once. Listen, many people are in tears. It's too tragic. The cruelty of the Red Cambodian government is horrifying. More than 20,000 people were brutally murdered in a place that was originally a cemetery for overseas Chinese in China. The Memorial Hall of the murder hall preserves 9,000 heads dug up. This is a place worth visiting. It gives us an unknown and painful history.