In my novel, I was planning to have the palace/citadel type place located inside a mountain- so like a sort of cave type thing, but on a bigger scale.
There would be decoration around the entrance of the palace, and staircases leading up to it, but the palace itself would be built into the actual mountainside.
The people in my story aren't super advanced with technology, so I'm not entirely sure if this is extending past their capabilities or not. And also whether this is actually possible by any means- for instance would the mountain have to be made from hard rock for it to sustain its shape?
Any sort of advice/ideas on whether this is possible or how I would have to adapt things to make it possible would be much appreciated!! Thanks!