I don’t know that there remains a literal refuge tip smoldering in the Valley of Hinnom beyond Jerusalem’s walls… somehow doubt it, but no… Jesus’ ‘ gehenna ’ was an object lesson — putting in figurative language that which was real to them, showing that if they didn’t pull their heads in ( with regards to Rome ) they would become in-kind the same, i.e., a smoldering heap of refuge full of worms, gnashing of teeth in out darkness — the rubble and ruin of exclusion, etc.
John Loftus in his book “Why I Became An Atheist” talks of Gehenna:
By contrast , hell (Greek: Gehenna) is a valley outside Jerusalem where the rubbish was burned. I actually visited this place in 1988 and rubbish was still burned there. page 448
Gehenna is a real place outside Jerusalem and is still there. This is a completely different context than the figurative new Jerusalem and figurative lake of fire.
Those who rejected Christ did so in ignorance ( Lk 23:23; 1Cor 2:8; 1Tim 1:13 ) and although most paying the temporal price and consequence ( note: not temporary ) of AD70 did so as part of those who were temporarily hardened, i.e., Paul’s “ in part ” ( Rom 11:7, 25 ) — thus having “ their part in ” the lake of fire ( Rev 21:8 ).
The ignorance here isn’t the kind you are trying to refer to. They had rejected the infinite God-man. This is a sin like no other seeing who God is. All other sins are finite but this is the eternal sin done out a hardened heart towards God.
**Ephesians 4:18~~They are darkened in their understanding and separated from the life of God because of the ignorance that is in them due to the hardening of their hearts.