 Illinois Center neighborhood has three-level streets.The eastern terminus of U. S. Route 66, an iconic highway in the United States first charted in 1926, was located at Jackson Boulevard and Michigan Avenue.When Illinois and Missouri agreed that the local signage for Route 66 should be replaced with that of Interstate 55 as the route was predominately north-south in those states, most signs of the former highway in Chicago were removed without incident but the final sign on the corner of Jackson and Michigan was removed with great fanfare on January 13, 1977, and replaced with a sign reading "END OF ROUTE 66".