Collinsville, Illinois is a charming city located just 12 miles east of St. Louis, Missouri. Known for its iconic water tower, which is listed on the National Register of Historic Places, Collinsville offers visitors a mix of history, culture, and outdoor recreation. Explore the Cahokia Mounds State Historic Site, enjoy a day at the Splash City Waterpark, or attend the annual Italian Fest for a taste of local flavor.