Completed in 1973 and for 25 years the tallest building in the world, the 110-story Willis Tower has marked a major milestone in its transformation with the completion of a new Skydeck experience ...
The base of Manhattan's Citicorp Center, with St. Peter's Church at the lower left, was designed by William LeMessurier, who later admitted to making a mistake. His confession is often noted in ...
AMES, Iowa – Grant Schmitz, eyes inches from a 6.5-by-12-foot panel of ultra-high performance concrete, studied the smooth surface for tiny cracks. He and other research engineers carefully marked ...
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