"While the city in itself is something to explore, you should also check out the ruins at Nokor Wat. One of the highlights here is a detailed series of murals which depict religious torture scenes."
Kampong Cham isn't a city chock full of tourist attractions, but it's colonial charm and atmosphere will endear itself to you. There are a few temples to see in the area, including one of the country's mass graves.
Nokor Wat. An Angkorian temple dating from the 11th century, containing a standard assortment of Angkor architecture. Some of the mausoleums are open to tourists and contain piles of bones and skulls from the Khmer Rouge's genocidal reign. Inside one of the buildings is a very elaborate series of wall paintings, depicting torture and executions (of a religious nature), followed by scenes of heaven and the afterlife. This is not always an accessible building, as a Monk has to unlock it for you to enter. He usually does, though your driver may ask you to refrain. To get there by bicycle follow the road to Phnom Penh for about 1 km and turn left when you see a dusty road going down through a gate (there's also a sign). The tourist police may ask you for money for their own purposes. If you are stingy, you can enter the temple from the other side for free.
Don't miss the beautiful sunset in the old Angkorian ruins. The visit to this site can easily be combined with a trip to the mountains Pros and Srei.
The original killing field in this area was between Phnom Proh and Phnom Sray, a short moto ride out of town, but after the end of the Khmer Rouge period monks collected the bones and interred them here. Wat Nokor is set a couple of hundred metres to the south of the Wat Nokor traffic circle at the eastern end of town. You could walk here, but a motorbike ride is more comfortable.
If you are interested in traditional Cambodian dances, there is a daily performance at 5 p.m. (except Sunday) in the Wat Nokor (Nokor Bachey Temple) by the children and teenagers looked after and educated by BSDA, a Non Governmental Organization (NGO) located at the temple site and managed by the monks. Entrance is free, donations are certainly welcome. No need for reservations.