Artistic liscence,allegory and mistranslations. "Hell" is used to describe a literal place that Isiah envisioned to be the place for evil.
Jeremiah 7:31–32 (ESV) — And they have built the high places of Topheth, which is in the Valley of the Son of Hinnom, to burn their sons and their daughters in the fire, which I did not command, nor did it come into my mind. Therefore, behold, the days are coming, declares the Lord, when it will no more be called Topheth, or the Valley of the Son of Hinnom, but the Valley of Slaughter; for they will bury in Topheth, because there is no room elsewhere.
Isaiah 30:33 (HCSB) — Indeed! Topheth has been ready for the king for a long time now. His funeral pyre is deep and wide, with plenty of fire and wood. The breath of the Lord, like a torrent of brimstone, kindles it.
Isaiah 66:24 (ESV) — “And they shall go out and look on the dead bodies of the men who have rebelled against me. For their worm shall not die, their fire shall not be quenched, and they shall be an abhorrence to all flesh.”
Revelations even says the earth will be back,so there is no complete annihalation where everybody goes to hell or either heaven,people will still be on earth.