The Alderman stairs are an access point and slipway/wharf near St Katherine's Dock, London.
Date: pre 1746 (featured on John Rocque’s map)
A good history of the stairs:
https://alondoninheritance.com/london-history/life-death-alderman-stairs/
Thames Discovery record:
http://www.thamesdiscovery.org/riverpedia/alderman-stairs-riverpedia
Historic England record:
https://historicengland.org.uk/listing/the-list/list-entry/1357873
1282 photos taken in June 2019 with a Sony a6000 and processed in Agisoft Metashape.