From the Minnesota Historical Society comes Placeography, a wiki that features “any place anywhere that any one can edit.” Folks can contribute the story of a particular house, farm, street, school, business, historic structure, etc. There are also several tours/architectural tours, including John Dillinger Slept Here and a page devoted only to Pseudonymous Minnesota (the real places that inspired fictional towns in books and film and Prairie Home Companion). Rounding out the helpful resources are pages devoted to National Register of Historic Places sites in the state and explanations of how to do research on your own home and find historic preservation guides and FAQs.
This one’s definitely going in our Examples section for how to engage communities online with wikis (site statistics, as of today, 70,190 “accesses”). It invites users to write the history of their place–and to think critically about what makes places special–without losing its sense of fun.