12. Kemper Arena

Location:  Kansas City, MO

Year of Fail: 1979

To avoid using columns that would obstruct field views, the roof on Kemper Arena was suspended from trusses. In 1979, the roof collapsed, luckily without any people inside. Designed to release rainwater slowly to reduce flooding, a heavy storm caused water to collect and pool anywhere the roof sagged, creating excess weight. In addition, the roof was suspended from hangers, and the strength of their bolts had been miscalculated.