There are many statues of Hades.
Hades can be found in the Underworld.
Hades is another term for Hell.
Hades resides in the Underworld.
Because Hades is the God of the Underworld and many jewels are found underground they have become a symbol of Hades.
Gold and other types of metal was found underground, where Hades' Kingdom is also found.
Hades is a God, not a place. So therefor Cerberus is not located anywhere in Hades. However, Cerberus guards the Underworld. But he is usually found at Hades' side.
The offering to Hades is pomegranates, which are found on the tree above the creature in the Garden of the Sphinx.
Cerberus was the offspring of Typhon and Echidna. During one of his quests with his brothers Zeua and Poseidon, he found Cerberus and took a liking to him. Cerberus was then given to Hades by the parents because they saw that Hades would take care of him.
The deep part of the underworld. It was founded when Hades was making breakfast.
Demeter was not consulted about it, her daughter had been kidnapped by her husband Hades - which Hades had gotten the permission of Zeus first.
It's the myth of Persephone being kidnapped by Hades, the search for her by her mother Demeter, and then her being found in the Underworld eating the food of the Hades' garden and then having to spend half the year above the earth and half below as the Queen of the Dead.