The Walnut Room has been serving hungry shoppers at Marshall Field's (and now Macy's) since 1907.  Back then, there were no local dining options for women, so one of the clerks in the millinery department, a certain "Mrs. Hering," baked homemade chicken pot pies and brought them in to keep her clientele from defecting when suffering from hunger pangs.  These same chicken pot pies remain on the menu today.  The cavernous 17,000 seventh-floor restaurant features walls constructed with Circasian wood imported from Russia and chandeliers fabricated with original Austrian crystal. During the holidays, the Great Tree is a monumental attraction.  It approaches 50 feet in height and contains about 19,000 lights.  Dining under the Great Tree has been a longtime Chicago tradition, and some groups have been coming for 60 or more years in a row.  The annual spring flower show is another major attraction in the Walnut Room.