invisible cities by Italo Calvino has some great fodder for inspiration especially in fantastical city building. A gift from my good friend Cat, she suggested it might give me some DMing ideas. Indeed, there would be any number of big ideas to populate a campaign. The only trick about it is that it's almost poetry and therefore would need a little transitioning to be usable. An excerpt:
From there, after six days and seven nights, you arrive at Zobeide, the white city, well exposed to the moon, with streets wound about themselves as in a skein. They tell this tale of its foundation: men of various nations had an identical dream. They saw a woman running at night through an unknown city; she was seen from behind, with long hair, and she was naked. They dreamed of pursuing her. As they twisted and turned, each of them lost her. After the dream, they set out in search of that city; they never found it, but they found one another; they decided to build a city like the one in the dream. In laying out the streets, each followed the course of his pursuit; at the spot where they had lost the fugitive's trail, they arranged spaces and walls differently from the dream, so she would be unable to escape again.
This was the city of Zobeide, where they settled, waiting for that scene to be repeated one night. None of them, asleep or awake, ever saw the woman again. The city's streets were streets where they went to work every day, with no link any more to the dreamed chase. Which, for that matter, had long been forgotten.
New men arrived from other lands, having had a dream like theirs, and in the city of Zobeide, they recognized something from the streets of the dream, and they changed the positions of arcades and stairways to resemble more closely the path of the pursued woman and so, at the spot where she had vanished, there would remain no avenue of escape.
The first to arrive could not understand what drew these people to Zobeide, this ugly city, this trap.