This image is part of a personal project I've been working on for some time.
Without spoiling too much of the background story, the title of the image applies to the city's status among several other underground villages. It's the capital of an 'archipelago' of huge underground caverns, which is why it's referred to as the Netherworld, even though it is technically above sea level.
The city itself is inhabited by a plethora of different people. The two most notable among these, the religious caste and the elitarian ruler class, have secluded themselves from the rest of the people by constructing giant walls around their city quarters. The highest dwellings of the city - reserved only for the most priviliged - have been carved out of solid marble, a rock not native to the local environment.
Hope you like it, as always, critique is more than welcome.