Moons of Jupiter 👀

The radiation is a big problem, but if you can work around it somehow, then Ganymede becomes the gas station of the solar system, and we could put geosynchronous satellites in sequence over Jupiter itself and live there - there's an amazing quirk that right where Jupiter's atmosphere ends, is 1 g, so millions of years in the future the ultimate megaoroject will be turning Jupiter into a living space equivalent to a few hundred Earths.