In nearby Oak Park, step inside Frank Lloyd Wright's home and studio, where for 20 years he pioneered an entirely new architectural vision for America.
America will need 2m more of them in the next decade alone, says Ai-Jen Poo of the National Domestic Workers Alliance, an organisation that represents those who work in other people's homes.
A millionaire many times over, on her death in 1990 Garbo bequeathed a pittance to her live-in maid; she failed to increase her annual tip to the doorman of her building in Manhattan for 37 years.