They are dedicated to the planet Mars.
There's one in Nong Khai that I know of.
Is there a Wat An Khanh near you? Have you got some pics of it or a Google Images link to it?
I'm looking for unique characteristics about temple design/features, ceremonies and monk rituals.
And why it is that there are temples dedicated to Mars in the first place?!
Are there temples dedicated to the other planets or the moon?
