Illinois is home to numerous historic sites that showcase its rich cultural heritage. Notable locations include the Lincoln Home National Historic Site, where Abraham Lincoln lived before becoming president, and the Cahokia Mounds, which are ancient Native American earthworks. These sites offer visitors a glimpse into the state's past and its significant contributions to American history. In addition to these landmarks, Illinois features the Route 66 historic highway, known as the "Main Street of America," which played a crucial role in the westward expansion. The Ulysses S. Grant Home in Galena also highlights the life of the Civil War general and 18th president, providing insights into his legacy and the era he influenced.