Stately Reminder of a Bygone Era
Union Station (recently renovated about 15 years ago) harkens back to a day where trains were the fastest and most civilized way to travel long distances.
The Grand Hall, despite an almost empty ghost-like demeanor, is nothing short of impressively breathtaking. Pillars, topped with gold-toned classical statues, flank the edges and the dearth of benches seems to suggest that Union Station was meant to handle more traffic than it does today.
There are a number of restaurants and small shops selling a variety of Chicago souvenirs and foodstuffs (hot dogs, deep-dish pizza, and steak and particularly good in Chicago) and both the Chicago Metra and Amtrak operate out of the station.
Union Station, unlike many of its contempories, has been kept up well and is clean as one can expect of a train station. The bathrooms aren't bad at all and things generally seem to be under control.
If you're in Chicago, you should make a point to visit Union Station, even if just to see the Grand Hall.