D&D museum
Traveling museum for cons, and at the SciFi Museum in Seattle for its first stop?
Or permanent museum in Bellevue, WA (where WOTC actually is, as a I understand it) . . . the Doll Museum in Bellevue just shut down, so there's an available museum building . . .
The alternative, for books at least, is to redo all the scans to get really high quality electronic versions.
Also good.