Millennium Bridge

The London Millennium Footbridge is a pedestrian-only steel suspension bridge crossing the River Thames in London, England, linking Bankside with the City. It is located between Southwark Bridge (downstream) and Blackfriars Bridge (upstream). With construction beginning in 1998, it was the first new bridge across the Thames in London since Tower Bridge in 1894 and it is owned and maintained by the City Bridge Trust, a charitable trust overseen by the City of London Corporation.

Londoners nicknamed the bridge the Wobbly Bridge after crowds of pedestrians felt an unexpected swaying motion on the first two days after the bridge opened. The bridge was closed and modified, and further modifications eliminated the "wobble" entirely.
Construction began in late 1998 with the main works beginning on 28 April 1999 by Monberg Thorsen and Sir Robert McAlpine. The bridge was completed at a cost of £18.2m (£2.2m over budget) and opened on 10 June 2000 (2 months late). Unexpected lateral vibration (resonant structural response) caused the bridge to be closed on 12 June for modifications.