KANSAS CITYstraddles the state line between Kansas and Missouri. Its beautiful landscaped parks, wide boulevards, sophisticated museums, fine architecture and urban districts make it a very attractive city. Downtown is the historic district known as City Market which is located on the bluffs of the Missouri River. The riverfront's 19th century warehouses have been transformed into colorful shops, cafés, a lively farmers' market and the Treasure of the Steamboat Arabia Museum which displays artifacts salvaged from a 1856 wreck. Southeast of downtown is the 18th & Vine Heritage District where the American Jazz Museum which chronicles the city's swinging jazz era.