Where do we go after we die?

We don't go anywhere. Although the major religions support the idea of an afterlife or reincarnation, that's just wishful thinking. There is no "me" other than the body, no disembodied soul to persist after the body fails. How the body is disposed of is irrelevant. Once it ceases to function, to live, that's all there is of "me." Alternative theories have long cultural histories but are merely articles of faith without evidence.