U is for Underground
I'm sure it won't surprise any of you, but if I could live anywhere in the MirrorWorld, it would be underground in a Goyl city. In my opinion, the underground world of the Goyl is the most beautiful place in all the MirrorWorld. Imagine frozen waterfalls, crystal flowers blossoming, mosaics made by some of the greatest artisans in the world (I just figure they have to be. Growing up surrounded by so much color and beauty has to have created amazing artists underground.)
"Houses, towers and palaces grew from the bottom of the cave and up its walls, like wasps' nests." - RECKLESS, Cornelia Funke. (the city around the Goyl palace.)
"Higher up, above the houses and the web of bridges that looked as if it had been woven by a steel-spinning spider, hung a series of gigantic stalactites. The largest one was dotted with metal towers pointing downward like spears, and the whole structure glowed as if its walls had been saturated with the moonlight of the world above." - Reckless, Cornelia Funke (about the Goyl palace)
Guys, I would move there TODAY. As a bonus, there's no Donald Trump there! That's a win by itself!