What is the Willis tower made of?

Jaz Mya Castaneda | Oct 1, 2019 | Category: Tourist attraction in Chicago, Illinois

Willis Tower - All questions

Address: 233 S Wacker Dr, Chicago, IL 60606, USA

Manuel Gago | Oct 1, 2019

Concrete and Steel

Bryon Wiltse | Oct 1, 2019

Add glass to the concrete and steel

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