A collection of more than 1,000 individually-wrapped moist towelettes, on display in the lobby of the MSU planetarium in East Lansing. Specimens come from airlines, restaurants, conferences, and political campaigns from every continent, organised by origin and intended use.
It is exactly as ridiculous and charming as it sounds. The museum is free and visible whenever the planetarium is open. You can also add to the collection — donations are encouraged.