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 became known as ‘The Windmill City’ for being the largest windmill producer of the time. Fermilab, 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. Batavia is part of a Tri-Cities area, along with St. Charles and Geneva, all western suburbs of similar size and relative socioeconomic condition.