The name says it all, pretty much. The world of Mad Scientist and trans-dimensional adventurer Argus Wilverton and his massive but dim manservant Caw. (Caw created by corwin77). Also the world of airship engineer James Carver and phlogiston theorist Doctor Addison Gaveston.
A new one, but one I want to write in more. Posthuman warriors, nanotechnology and a neovictorian aesthetic in a world half-slid through apocalypse and half-way through as societal singularity.
The Dead Hobo Prophecies:
A world of weird, lovecraftian horrors and wacky nightmares.
Set in the real world, invariably focussed on people in depressing failed romances or similar bleak situations.
Based on a couple dreams I had a few years ago. An extrapolation of the Amber universe based on a single Amberite bloodline over centuries, with the end result being a sort of World of Darkness conspiracy/underworld sort of setting.
There are a bunch of them that aren't set in any specific place, but I'm obessive enough to want to categorize the ones where the ficton is specific.