Millennium Bridge A Bridge That Moves 

The Millennium Bridge, located in London, UK, opened in 2000 but quickly became infamous for its unexpected wobble caused by pedestrians walking in sync . The bridge, which spans the River Thames and connects the Tate Modern with St. Paul’s Cathedral 

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experienced a phenomenon called "synchronous lateral excitation," where the natural rhythm of foot traffic caused excessive vibrations. Engineers added dynamic dampers to stabilize the bridge, and it was reopened in 2002 after modifications. 

This incident showcased the importance of understanding human interaction with infrastructure and led to improvements in bridge design.