About 4km north of Battambang, Wat Somrong Knong was built in the 19th century on the site of a pre-Angkorian temple complex. The Khmer Rouge used the temple grounds as a prison and it's believed that around 10,000 people were executed here. The complex today houses the gorgeous main pagoda and a mishmash of ancient ruins, glittery modern structures and memorials to those who perished here.
Just outside the complex's southwest wall is a memorial shrine festooned with grisly bas-reliefs of Khmer Rouge atrocities. A glass case contains victims' skulls.
To get here, cross the bridge over the Sangker River 1.7km north of the ferry pier, then continue north on the other side for another 1.7km and take a right on a small dirt road. Continue 500m down this road to the site. If coming from the north, it's about 2.5km south of the bridge near the prahoc factory, though that bridge was out of commission during research.