I get to go out on missions, as part of the survey corps. We're trying to reclaim the land between walls Maria and Rose again. Not exactly easy when things are trying to eat you on the way. I've never been outside of wall Maria, though, if that's what you're asking.
I don't think Hanji is related to them at all, no. But I think they would absolutely lose their mind here. They're... scarily excitable sometimes.