I freely admit that I may be guessing at this but I do believe this is a royal tomb at the Silver Pagoda which is attached to the Royal Palace in Phnom Penh. I know this simply by listening to the tour guide that was giving a tour. I generally skip the guides, not due to costs but I’m there for photos and I don’t think its fair for me to drag a guide around while I frame shots or look for different angles.
There are a few of these around the temple grounds, each for a different member of the royal family (again, based on what I heard). This was like one of the first ones I encountered when I walked into that area of the palace compound.
This is a bit HDR but I didn’t go overboard. I just used one exposure to make it. To keep the image from breaking down I didn’t push it too much. On the smaller sensor cameras the image quality can go to crap quickly if you start pushing pixels.