When people talk about OTW's Open Doors committee, it's often about their efforts to sustain and preserve fansites. These can be put at risk by any number of things. Open Doors does the slow, careful work of importing other fan archives onto AO3 so the works they hold will not be lost to future fans.
But Open Doors has another project which people may not know about: the Fan Culture Preservation Project (FCPP). FCPP is a joint venture with the University of Iowa to archive physical items from fan history such as 'zines, flyers, fanvids, t-shirts and other fan-made ephemera.
Although part of the University's Special Collections, the FCPP is open to the public. Any fan who visits the library can view the collections without needing special permission. All you need is a desire to learn more about the history of fan culture, a willingness to follow the library's rules, and some time to spend curled up in the library.