When first built in 1889, many referred to the Auditorium Building as the eighth wonder of the world. It was the tallest building in Chicago, the biggest building in the country and boasted the world's best theater acoustics and put famed architects Louis Sullivan and Dankmar Adler in the spotlight. The Richardsonian Romanesque-style building combined a theater, hotel and offices all under one roof. Louis Sullivan covered nearly every inch of the building’s interior with his trademark nature-inspired designs – many of which can still be seen today. In 1946 the building was sold to Roosevelt University which has called it home ever since.

Behind the Scenes Access: Visit the 10th Floor Library and Ganz Hall.

Hours: Saturday and Sunday 9am-5pm

Architect(s): Louis Sullivan and Dankmar Adler

Year: 1889

Website: www.roosevelt.edu/auditoriumbuilding