Abe Lincoln. Swank martini club. It's easy to admire both, but it's hard to picture them together. So it goes with Illinois, a state split between the urban and up-to-the-minute delights of Chicago and "downstate" (i.e., not Chicago), a place knee-deep in Lincoln lore and other attractions that recall the Illinois of the 1800s. They can experience the museums, shopping, restaurants and nightlife of one of the world's premier cities and then, in a matter of hours, move to the tranquil countryside with its abundance of vintage architecture and historic sites.