In my fantasy world, there is a race of ghouls. They are a knit-tit community, and while they built underground cities, including reforming abandoned mines as living places, they eventually kept living down there, especially since they became full-on cities and not just settlements. My question is how long would it take to build an underground city? Here is some of the description:
- The population in these cities can range in the 1,000's
- These cities have sewer pipes, ventilation, and have well-systems to extract water
- There are not just homes and apartments, but also markets, prisons, workshops, churches, brothels, and just all the stuff you would see in a city during the Medieval Period and Renaissance.
- Some cities were not originally cities. Some are re-built mines, and usually the refurbished structures that became cities and not towns were catacombs or large dungeons.
- In re-built cities, there is the problem of fighting off feral creatures underground.
- There are large roads to transport carriages, small commercial boats, and goods, and these become more common as they start to trade more.
- Like any underground structure, these cities are loaded with giant pillars to keep it from collapsing, although many cities used the advent of magic
- The magic used is energy-based, it transforms energy into different forms, and has to follow the rules of thermodynamics.
For knowing what it looks like, these are some pictures found that resemble some of them, or at least the style: