Which iconic skyscraper suffered a major product recall when its glass panels began falling onto the streets below, leading to a complete refacing of the building at a cost of over $550 million?

In architectural history, product failures and recalls have shaped building codes and safety standards. This trivia question focuses on one of the most significant product recalls in modern architecture that changed how architects and engineers approach curtain wall systems and glass installations in skyscrapers. Test your knowledge of architectural product history!

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John Hancock Tower in Boston (now 200 Clarendon Street)
Burj Khalifa in Dubai
The Shard in London
One World Trade Center in New York