Congress Plaza Hotel, located on Michigan Ave in Chicago, Illinois. The Congress was originally named the Auditorium Annex when it was built to house visitors to the Columbian Exposition—the transformative World’s Fair of 1893.  The name referenced the Auditorium Theater across Congress Parkway, an acoustically magnificent structure designed by blockbuster architectural duo Dankmar Adler and Louis Sullivan.  The Annex’s original North Tower was designed by Clinton Warren, but Adler and…