Chicago

Chicago is the largest city of the state of Illinois.

History
In 1945 HYDRA planned to launch a HYDRA Parasit on Chicago.

In 2014, a terrorist cell run by a man named Baker discovered that the Zodiac still existed and stole it from S.H.I.E.L.D. with the intention of launching a terrorist strike at the Willis Tower in Chicago.

Captain America jumped out of the tower's Skydeck without a parachute to safely retrieve the Zodiac, counting on agent Rumlow to stop his fall.