Two structures built several years apart and later connected, the gleaming white Wrigley Building sports a clock tower inspired by the bell tower of the grand cathedral in Seville, Spain. The landmark headquarters of the chewing gum company—designed by Graham, Anderson, Probst & White—was instrumental in transforming Michigan Avenue from an area of warehouses to one of the most desirable spots in the city. Be sure to check it out at night, when lamps bounce light off the building's gleaming terra-cotta facade.
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