James Butler "Wild Bill" Hickok was born in what is now the village of Troy Grove on 27 May 1837. Hickok was a pioneer of the great plains and the state of Illinois established a memorial to perpetuate his memory.
If you go:
If hungry while in Troy Grove (pop. 250), I can vouch for "the world's largest ham sandwich" served at Cubby's Corner located on US Highway 52.
Links:

US Highway 52
2 miles west of I-39/7 miles north of I-80
Troy Grove, Illinois 61372 USA
karen.everingham@illinois.gov