Paradise, Eden, Zion, Olympus, Elysium, Elysian fields, Arcadia, Hesperides, Valhalla, Walhall, Nirvana, Alfardaws, Assama, Aflak

The closest antonyms to hell that I know are paradise and heaven. Other possibilities are Valhalla and the Elysian Fields.

You could call it Elysium or the Elysian Fields after the Greek place of the afterlife.

The Elysian Fields are a mythological place where ancient Greeks believed the souls of the deceased heroic and virtuous people went to rest. It is similar to Paradise in monotheist beliefs.

Elysian Fields is a concept from Greek mythology, representing a paradise or afterlife. It is not considered a tangible, physical place like heaven is in various religious beliefs.