Union Station is the third-busiest rail terminal in the U.S. It serves approximately 120,000 passengers every day. It is also Chicago’s only intercity rail hub. Most of Union Station is underground, but the head house is the architectural focal point of the nearly 10-block complex. It was begun by Daniel Burnham in 1913 and completed by the firm Graham, Anderson, Probst and White in 1925. The magnificent Beaux-Arts Great Hall is one of the busiest public spaces in Chicago. Ongoing renovations are transforming long-disused parts of the building into beautiful, functional spaces and amenities to enhance the passenger and visitor experience.