The world’s largest Starbucks Reserve Roastery is on Chicago’s Michigan Avenue, and each year more than 200,000 lbs of coffee are roasted and served at the 43,000-sq-ft location.

Where coffee meets Willy Wonka is what Starbucks fans will find at its Chicago Reserve Roastery on Michigan Avenue, in a renovation that turned the 43,000-sq-ft space into a retail experience as ...