The Sears Tower during construction, c. 1972. Upon completion, it was the world’s tallest building, a title it held until 1997. It was renamed the Willis Tower in 2009. Hedrich-Blessing Collection.

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21,000 years ago, the ice over Montreal was 3 kilometers thick, and dwarfed the Sears and CN Towers. The land is still rising back up like a sponge from the great weight of the ice. Conditions changing over time. (xkcd)