Marina city is a complex of two cylindrical towers near the Chicago River. Due to their unique shape, the towers are locally known as the 'corn cobs'.

Marina City is a complex of two 60-story towers built in 1964 by Bertrand GoldBerg,
a student of Mies van der Rohe. It
is a lively complex of apartments, recreation facilities, offices, restaurants,
banks, a theater and 18 stories of parking space.
The experimental complex was financed by unions who feared that the outflow
of people from the cities in the early sixties would lead to a decrease in jobs.
Marina city would

give an alternative to the villages and small towns, offering
everything in a small area.
The complex was at the time the biggest ever built in concrete and its shape
was in contrast with the contemporary architectural concepts of straight lines
and cubical apartment buildings. The cylindrical shape was used to have less
wind pressure. The architect chose reinforced concrete instead of steel as this
was the only material in which he could create the petal shapes of the apartments.
The Marina City, together with other famous concrete buildings of that era (TWA
terminal in
New York, the
Opera House in
Sydney) brought
architecture one step further. It is not the most famous building of Chicago,
but reinforced the image of Chicago as a city on the forefront of modern urban
architecture.