You'll probably see St Nicholas Ukrainian Catholic Cathedral across town before you actually find this incredible building. Take a seat inside if the doors are open or just take in the facade from outside.
This principal church in West Town is popular with travelers, so make sure it features on your travel plans. Don't think the sightseeing ends there, however. There are plenty more places waiting for you to discover after St Nicholas Ukrainian Catholic Cathedral. Wrigley Field, Millennium Park, and Willis Tower are nearby.