It follows the fates of two friends who discover a puzzle box that opens a gateway to a realm inhabited by sadomasochistic monsters known as the Cenobites.

The following locations occur outside of the normal realms inhabited by humans in The Dark Tower series.

The Underdark is described as "a vast subterranean realm inhabited by drow, mindflayers, aboleth, and other strange, sinister creatures.

Tracking the elusive toymaker down leads the bounty hunter into a realm inhabited by people with... unconventional talents.

Other areas include the human world, shown to possess a futuristic level of technology in Hour of Darkness, and "Celestia", a heavenly realm inhabited by angels.

Gandharva Kingdom refers to the realm inhabited by a people called the Gandharvas.

But the uneasy realm of caverns, parlors and cells, inhabited by unspoken intent, can be visited in the mind's eye only, like the architecture in dreams.

Wagner uses the metaphor of day and night in the second act to designate the realms inhabited by Tristan and Isolde.

This is a realm inhabited by Spirits, Angels and Devils, where humans are apparently nothing more than a fairytale.

The Green is a mystical realm inhabited by the minds of all members of the Parliament of Trees.