The ultimate application of ISS programs, at least in the near-term future, is to facilitate manned missions to Mars, something space visionaries have been pursuing for decades. But historically, space stations have played a far more integral role in deep space human exploration than just a place to develop technology. I’ve got a massive article coming this weekend about space stations and NASA, but in the meantime enjoy this gallery of some great space station concepts! Want to find the images and browse yourself? Here’s one gallery from NASA’s history office, and one from the Marshall Spaceflight Centre.