Joliet is a city in Will County and Kendall County in the U.S. state of Illinois. It continues to be Illinois' fastest growing city and one of the fastest growing in the United States. The main attractions in Joliet's City Center are the Harrah's Casino and Hotel, Joliet JackHammers baseball (Silver Cross Field), and the Rialto Square Theatre, the 'Jewel of Joliet', which has been called one of the world's 10 most beautiful theatres. Among local landmarks are the Joliet Area Historical Museum and Route 66 Visitors Center. The famous Joliet Prison (now closed) is near downtown on Collins Street and is featured in the television show Prison Break. The Joliet Arsenal (now the Abraham Lincoln National Cemetery and Midewin National Tallgrass Prairie) is in nearby Elwood. There are two riverboat casinos in Joliet: the Empress Casino near Channahon and Rockdale and a Harrah's hotel and casino downtown. Joliet is the only city in the State of Illinois to have two casinos.