For those unaware of what that means, the
Towers of Silence are probably the single biggest example. Turns out when you don't want to contaminate earth, water, or fire with your rotting dead (the Zoroastrians really, really hate rotting stuff and view it as having been possessed by a corruption demon) your only real disposal option left is to hang them up for carrion and then the bones are either coated with wax and buried or slowly melted with lime and then gravity filtered into the groundwater.