Limbo

https://catholicherald.co.uk/commentandblogs/2017/06/02/abandoning-limbo-would-leave-a-serious-gap-in-church-teaching/

As well as the limbo of the fathers, there is the limbo of the infants: the destination of babies who, though they cannot enter heaven because they have not been baptised, are guilty of no personal sin. As St Gregory Nazianzen put it, these infants “will neither be admitted by the just judge to the glory of Heaven nor condemned to suffer punishment.” That those who die in original sin only are confined to hell in this sense is not a theological opinion but a dogma of the Catholic Church solemnly defined by the seventeenth ecumenical council in 1438, which taught “the souls of those who depart this life in actual mortal sin, or in original sin alone, go down straightaway to hell to be punished, but with unequal pains.”
_

I think the church closed the deed on that place, but it sure provides a look into the cruelty and silliness of religion.