Fort De Chartres is a historic fortification located in Illinois, built by the French in the early 18th century. It served as a military outpost and a center for trade and diplomacy in the Mississippi River region. The fort played a significant role in the French and Indian War and later in the American Revolutionary War. The structure features a combination of earthworks and wooden palisades, designed to protect against attacks. Today, Fort De Chartres is a state historic site, offering visitors a glimpse into colonial life and military history, as well as beautiful views of the surrounding Mississippi River landscape.