My Khromarium has The Sinking City which I lifted from Chainsaw
https://hyperborea.boardhost.com/viewtopic.php?pid=2960#p2960
I'm going a bit more towards Venice than what Chainsaw outlines.
Nothing yet, but the party is taking the task of destroying a crystal as a favor to the Adventurers Guild Bar and Grill.
It's gonna be in a minor spire.
...and that's all I have at the moment, but I need to have something more before 8pm Eastern tomorrow :-)