Tengriism

[kılıç_mehmet]

Tengri? Yes I think I've heard of him.Worshipped, by the Mongols?

Not just them. By nearly all nations of Turan, Tengri has been the sole God of worship before the world religions kicked in.
Now, it only exists as a part of folklore, not with the same name though.

I always found ancestor worship mildly interesting, but particularly at its most extreme. If I remember correctly, the Chinchorro mummies were displayed in the homes of their relatives and revered. I could be mixing that up with another South American culture, but I am relatively certain it was them. This was thousands of years before the Egyptian mummies. What's even more fascinating is that some people still practice ancestor worship.

Well, such is not the case for Tengriism. It was customary to simply bury them somewhere that was known to be a burial ground, and ride horses over the fresh grave so it couldn't be known to looters.
The chinese, japanese and koreans practice a different variant of this.
They set up elaborate temples, dedicated to their ancestors.