The gleaming white 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. Its two structures were built several years apart and later connected, and its clock tower was inspired by the bell tower of the grand cathedral in Seville, Spain. Be sure to check it out at night, when lamps bounce light off the
building's terra-cotta facade. Its interior is undergoing a renovation.