Apparently, the engineers who designed the rotating amphitheater at the Hoover Dam took their proximity to Las Vegas too seriously. They took a gamble and designed the turntable, which holds 450 people, without using finite element analysis. Bad idea. Soon after the amphitheater opened, the turntable broke down. Engineering consultant David Dearth got a U.S. Department of Interior contract to determine the cause of the failure. He did use FEA, specifically MSC.visualNastran for Windows. Finding: Use stronger steel and bigger axle.