Heaven

Heaven is the plane on which angels and the olympians dwell and is one of the three planes of existence.

Olympus
Within heaven, the olympians built a permanent gateway from the plane of heaven to the mortal plane on Mt. Olympus. This gateway acted also as a conduit to siphon heaven fire energy from the mortal plane. This energy fueled the power and immortality of the olympians until the Olympus gateway was destroyed beginning the fall of the olympians.