Jer 32:35 - (Good News)35 They have built altars to Baal in Hinnom Valley
, to sacrifice their sons and daughters to the god Molech. I did not command them to do this, and it did not even enter my mind that they would do such a thing and make the people of Judah sin."
Hinnom valley, also known as Gehenna also known as hell.
What was built there? Altars to Baal
Sons and daughters were sacrificed to the God Molech
Pagans had many Gods.
So the altars in hell were built to
the purpose of sacrificing their children to Molech. (molech sometimes called the god of the underworld)
The above is just my opinion of this verse and I would like input on agree or another interpretation thank you.