Docents conduct the tours and focus in part on the architecture of the building which was designed by Daniel Burnham and finished in 1925, after his death.
Of course, the most impressive place in the structure is the beau-arts-style Great Hall which was very modern for its time period. It has 18 Corinthian columns, pink marble floors and a five-story-high atrium with sun coming in from the skylight.
It is impressive to say the least.
It was the site for many World War II farewells.
As Windy City Road Warrior Dave Clark likes to point out, Union Station's location by the Chicago River and Route 66 shows the growth of Chicago due to the various modes of transportation.
The tours meet at Union Station, 500 W. Jackson Blvd at 1 p.m. on Nov. 9, 23, Dec. 14 and 21, Jan. 25 and Feb. 22. Cost is $25 ( $20 for history museum members. www.chicagohistory.org.