Perhaps dungeons for those who aren't. No one alive has any knowledge of it so we just sit and wait and opine.
I think many very wicked people believe what they do is God's will and He will welcome them to their etermal spot in Heaven for eternity. I believe there are millions of them...billions perhaps worldwide.
I wonder if God has checklist of what He will and will not tolerate in His Heavenly Space?
Maybe it will be posted outside the Pearly Gates so that those who do not qualify can just turn around and go back to another place.
The top first disqualifier? HARMING OTHERS BY WORDS AND DEED PURPOSEFULLY. How many will be able to say they never did?
Sometimes you harm inadvertently due to ignorance or stupidity but it was not your intent. I think God would know and allow such homo saps as those to live forever with Him in Heaven but give them a different section to live in apart from those WHO NEVER HARMED OTHERS BY WORD OR DEED.