Myst! It's been so long since I saw any art for this seriously underrated game. It was the first one I played through with my father. Thank you!
One of the most crucial parts of MYST was the perfect world building; each "age" was a character in its own right: a self contained ecosystem where everything works by its own set of rules. The civilization you've depicted has one of the most unique and varied aesthetics that blends seamlessly into the subterranean environment poth stylistically for the viewers AND practically within the setting. I wish I could favorite this more than once!