1. St. Francis Dam, 1928
Self-taught engineer William Mulholland built this LA dam on a defective foundation and ignored the geology of the surrounding canyon. He also dismissed cracks that formed as soon as the reservoir behind it was filled. Five days later, it ruptured, killing 450 people and destroying entire towns (along with Mulholland’s career).
2. Kansas City Hyatt walkways, 1981
Walkways crisscrossing the hotels’ multistory atrium collapsed, domino-style, raining debris and hundreds of people onto the packed dance contest below. The cause: grossly negligent design and use of beams that could support only 30 percent of the load.

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