L5 Outpost (Patreon)

Here's a sketch, by Mars pioneer Jessica Ball, of the L5 space station. After her momentous first steps on Mars, Jessica became an advocate for a major staging post to be built in Earth orbit to allow for easier transfers to the Moon and Mars. Ball eventually headed up the joint ESA, NASA, Roscosmos and CNSA project to build such a station at the L5 Lagrange point in the Earth-Moon system. 

Finished in the early 2050s the station was part space hub, part science facility, part orbital assembly point. From here almost all the major crewed missions were launched for the next fifty years. The station grew in size from its initial form - an extra ring was added, along with a flywheel to spin in the opposite direction. This allowed a huge increase in the population of the station, with the crew now having gravity-analog spin.