There are two theories regarding the origin and meaning of the city’s name, both attributed to the language of the Native Americans who lived here before white settlers. One definition joins "woone" meaning thunder and "socket" meaning mist, given the city’s location at the largest falls of the Blackstone River. Historians also suggest that the name refers to the Woonsocket Hill in present day North Smithfield, some 3 miles southwest of the city, which was mentioned by Roger Williams in a 1660 letter. Woonsocket is home to one of the best museums about immigrant factory life and textile milling in the country. It is also home to the headquarters of Fortune 500 company CVS Corporation.