The Willowbrook Ballroom, with its 5,400 square feet of dance floor, was the top choice for ballroom dance aficionados on Dec. 19, 1981, in Willow Springs, Illinois. (Carl Wagner/Chicago Tribune) ...

Derek Hough and Hayley Erbert Hough celebrate her return to the ballroom with a moving routine to "Beautiful Things" by Benson Boone. (Eric McCandless/Disney) And then there were eight! Dancing ...