Elysium

Elysium is the part of the Underworld where those who had died a hero's death and/or had a life full of good deeds reside.

It is a small section of the Underworld (compared to the Fields of Asphodel or even the Fields of Punishment) and surrounds a lake containing the Isles of the Blest. If one chooses to be reborn three times and reaches Elysium each time, they are invited to the Isles of the Blest.

It is like a gated community, with golden gates, and laughter inside. One can smell barbecue cooking from inside. Souls can only go to Elysium when they go to the council. However, most souls don't want to take that risk and just go to the Fields of Asphodel.

The Lightning Thief
When entering the underworld for the first time, Percy sees Elysium in the distance.