Good question, which I think might apply to the dead who have been unsaved up until the final judgment. But, during the final judgment as depicted in Revelation 20:11-15, Hell (or Hades) is described as a "lake of fire" reserved for Lucifer, his minions, and those who have consistently denied the Father.

I do, on the other hand, wonder if those who have died up until now (saved and unsaved) wander the earth awaiting the final judgment. Christ said He would be going to prepare the new Jerusalem (in Heaven) for the believers, which makes me think that only a select few old saints are actually in Heaven right now. The rest of the meek shall inherit the earth after the new Jerusalem descends as the capital of the earth. If this is true, then either the dead are in a state of suspended animation, are merely sleeping (as described in Job 14:12 and John 11:11-13), or their souls are left to wander the earth until the rapture or final judgment.

Either way, it's comforting to know that we won't just cease to exist after we die, but rather will still have something to look forward to, or something to regret for all eternity.