St. Louis is a major city located in the state of Missouri, along the western bank of the Mississippi River. It is known for its iconic Gateway Arch, which symbolizes westward expansion in the United States. Founded in 1764, St. Louis has a rich history and was an important center for trade and transportation in the 19th century. The city is home to several cultural institutions, including the St. Louis Art Museum and the Missouri Botanical Garden. St. Louis also hosts various annual events, such as the St. Louis Mardi Gras, one of the largest celebrations outside of New Orleans. The city is known for its diverse neighborhoods and vibrant music scene.