The Old Courthouse Historic District is located in St. Louis, Missouri and features a collection of historic buildings that reflect the architectural styles of the 19th century. The centerpiece is the Old Courthouse, a significant landmark where important legal cases, including the Dred Scott case, were heard. Designated as a historic district, it showcases various structures that contribute to the area's cultural heritage. Visitors can explore the district to appreciate its historical significance and architectural beauty, making it a popular destination for both locals and tourists interested in American history.