The Old Market area in Siem Reap constantly surprises you. I wandered into the clothes section and then stumbled, unexpectedly, into the food area, which you can smell before you see!
It's absolutely packed with locals buying their daily groceries, and walking around involves you squeezing between people and chicken feet sticking out into the walkway. All the vendors are either on the floor or on tables with all their produce around them. Definitely a place to go with a camera to capture some true Cambodia moments.