Antarctic city is good. I like underwater cities personally. A decent depth of water is very good protection against an awful lot of stuff, including almost a

Antarctic city is good. I like underwater cities personally. A decent depth of water is very good protection against an awful lot of stuff, including almost anything Mars would be good for, and if you still love space, any technology we build to live deep in the ocean can probably be reused on Europa. It's also, to bring it back to the 'iteration' discussion way way easier to iterate building underwater cities than building habitats on Mars.