The Millennium Bridge earned its nickname "the Wobbly Bridge" within two days of opening in June 2000, when thousands of pedestrians discovered their footsteps were making the whole structure sway.

Engineers hadn't accounted for synchronous lateral excitation: the tendency of walkers to unconsciously match their strides to a bridge's movement, amplifying the wobble with each step. It took two years and £5 million worth of dampers to fix the problem.

Norman Foster designed this steel suspension footbridge to hang low across the Thames like a "blade of light," connecting St Paul's Cathedral to Tate Modern. The alignment is deliberate: stand at the south end, and the cathedral's dome frames your view perfectly.

VoiceMap's self-guided audio tours trace the bridge's role in London's Southbank regeneration and its infamous cameo in the Harry Potter films, where Death Eaters sent it crashing into the river.