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Metals in Construction: Past and Present
 Completed in 1931 and considered a marvel of its time, the Empire States Building took 57,000 tons of steel and 7,000,000 man hours to complete. The steel structure allowed the tower rises to 1,250 feet (381 m) at the 102nd floor, and its full structural height (including broadcast antenna) reaches 1,453 feet and 8 9/16th inches (443 m). It was the first building to have more than 100 floors. On May 1, 2006, The Empire State Building celebrated its 75th birthday.
 The Guggenheim museum in Bilboa, Spain considered one of the most significant architectural feats of the modern era was completed in 1997 and designed by Frank O. Gehry. The now iconic structure utilizes a steel frame covered by half-millimeter thick titanium panels to give it its characteristic metallic exterior. Built on a 32,500 square meter site in the center of the city, the complex design of the main steel, stone, glass and titanium curves were created with the aid of computers.
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