Batavia is a suburb of Chicago. It was founded in 1833, and is the oldest city in Kane County, Illinois. A small portion of Batavia lies in DuPage County. During the latter part of the 19th century, Batavia, home to six American-style windmill manufacturing companies, became known as "The Windmill City." Fermi National Accelerator Laboratory, a federal government-sponsored high-energy physics laboratory, where both the bottom quark and the top quark were first detected, is located in the city.