Richard Dreihaus Museum is housed in a wealthy family mansion very representive of the gilded age (late 19th and early 20th century) architecture and interior styles. $20 admission + $5 audio guide. The house cost $450K and 4 years to build in 1880s (average American families make ~$400 a year) commissioned by Samuel Nickerson Family (president of First Bank of Chicago). The family left and sold the house in 1900 and it changed hands several times and last bought by Richard Dreihaus, a financier and philanthropist, in 2002 ... the house underwent significant renovation from 2003-2008 and opened to public as a non-profit museum