Venusian Floating City

The cities of venus float around 50km from the surface, kept aloft by a mix of bouyancy and powerful engines. Power comes for geothermal plants on the surface that are connected to the cities by cables.

As well as acting as a logistics hub for imperial commerce and also make money from plastic production (which can be synthesised for the atmonsphere), refining goods (so they can be sent on with less mass) and a booming tourism industry.