Sandwich is a city in DeKalb, Kendall, and LaSalle counties. Politician "Long John" Wentworth named it after his home of Sandwich, New Hampshire.

Sandwich is the home of the Sandwich Fair, which first started as an annual livestock show in DeKalb County. Held yearly, the Wednesday–Sunday after Labor Day since 1888, it is one of the oldest continuing county fairs in the state of Illinois, drawing daily crowds of more than 100,000, with the top attendance days reaching more than 200,000 fair-goers. (Wikipedia)

Other Illinois towns with unique nouns for names: Bath, Diamond, Energy, Equality, Flora, Justice, Liberty, Magnolia, and Pearl.