One of my favourite recordings of a dynamic structure
https://www.youtube.com/watch?v=oI2ntcRCJlU
Princes Island Suspension Bridge 2010, field recording

YouTube
@jgrzinich nice.
have you heard this recording by Aino Tytti of a radio mast? download link is in the title, 'Hellissandur Mast [GRD 7970]'
https://touchradio.org.uk/touch_radio_96_aino_tytti.html
Touch Radio 96 | Aino Tytti | TouchRadio

@GuyBirkin Yes, that's a great one!