One example is the 'Cirith Ungol' in J.R.R. Tolkien's 'The Lord of the Rings'. It is a dark and menacing place filled with spiders and danger. Another is the 'Underworld' in some Greek - mythology - based novels. It has different levels and areas for different types of souls, creating a complex purgatory - like setting.
The 'Fayth Scar' in 'Final Fantasy X' (if we consider the game - to - novel adaptation). It is a place where the spirits of the dead are held and where the main characters have to face their inner demons. The Scar has a desolate and otherworldly feel, with strange energy fluxes and ancient machinery, which makes it a great example of a well - drawn fantasy purgatory.
In Dante Alighieri's 'The Divine Comedy', the Purgatorio is a well - known example. It is a place of purification where souls ascend through different levels of penance. Each level has its own challenges and symbolic representations. Also, in Neil Gaiman's 'American Gods', the various liminal spaces can be seen as a form of purgatory, where forgotten gods and lost souls exist in a strange in - between state.