The Tacoma Narrows Bridge collapsed from resonance, not wind

On 7 November 1940, the Tacoma Narrows suspension bridge in Washington State began oscillating violently in 40 mph winds and collapsed into Puget Sound just four months after opening. The popular explanation — resonance — was later refined: the collapse resulted from aeroelastic flutter, a feedback loop between the bridge's motion and aerodynamic forces. The disaster led to a fundamental rethink of bridge aerodynamics and the introduction of wind tunnel testing as standard in large-structure design. Engineers still use it as the canonical case study in unintended structural dynamics.

Source: Billah & Scanlan, Resonance, Tacoma Narrows Bridge Failure, and Undergraduate Physics Textbooks, American Journal of Physics (1991)