Aqua Tower, Chicago (must see)
The Aqua Tower is located on the 200 block of North Columbus Drive, and is surrounded by high-rises. Aqua is an 86-story mixed-use residential skyscraper in the Lakeshore East development in downtown Chicago. Designed by a team led by Jeanne Gang, the building is the tallest in the world, at 859 ft, to have a woman as lead architect. The Aqua was named the Emporis Skyscraper Award 2009 skyscraper of the year and was shortlisted in 2010 for the biannual International Highrise Award. To capture views of nearby landmarks for Aqua's residents, Gang stretched its balconies outward by as much as 12 feet. The result is a building composed of irregularly shaped concrete floor slabs which lend the facade an undulating, sculptural quality. The green roof on top of the tower base will be the largest in Chicago.
Sight description based on wikipedia