Marrick High and Low Smelt Mills and Peathouses in Swaledale.
https://historicengland.org.uk/listing/the-list/list-entry/1015824
3D LIDAR model processing: Many thanks to @jost_hobic, Cotswold Archaeology and @M_J_Gill, Avon Valley Archaeology Society.
Procedure further modified by Stephen Eastmead (@spe_ny), webmaster'@'altogetherarchaeology.org