The Old Whaling Station - Bunavoneader ( Bunabhainneadar ) - a chimney and a few ruins - and a few whale bones are now all that is left of a once thriving whaling industry in the Western Isles.
More information can be found about this amazing site & its history at the attached link.
Please note that to find the cache it is not necessary to disturb the site in any manner & to do so would be unwise with evidence of its decay all around.
https://www.virtualheb.co.uk/whaling-station-isle-of-harris/