Verified answer

I suggest looking up Hades on Wikipedia. Then go down to the bottom of the page and look at the sites the article used as sources

I love the Theoi Project website............

Here is a sample .....

In ancient Greek mythology and religion the DOMOS HAIDOU or "realm of Haides" was the land of the dead, the final resting place for departed souls. It was a dark and dismal realm in which bodiless ghosts flitted across grey fields of asphodel. The Homeric poets knew of no Islands of the Blessed or Elysian fields, or for that matter a Tartarean hell, instead all the spirits, including those of the great heroes, descended into Haides.

Lots of great quotes directly from the primary sources.