Reminded me of a cross between Pandora and Menzoberranzan. I must have spent an hour and half just walking around that city killing Falmer and Dwemer machines and even a giant. I didn't even know the trick with the giant orange orb until I read the wiki page for Blackreach. Needless to say, I went back to Blackreach just for that.
Is there ANYTHING else like that in this game that I have yet to discover? Maybe not in look and style, but is there another place with that large of a scale and equally as mesmerizing?