Hancock tower is  a 100 story tall skyscraper also located in Chicago, Illinois. Although it is a bit shorter than the Willis tower, it is still an architectural feat with a beautiful and intricate design. This tower is considered one of the most famous buildings of the structural expressionist style. You can see the skyscraper’s distinctive X-braced exterior pictured above. This is an architecual  and engineering technique the the architects used to achieve a record height. Although not as tall as the Willis tower located near here, this one stood out much more to me based off of its unique style and design.