Playas, Beaches, Plages, Strände, Spiagge...

It's a huer's lookout (locally nicknamed 'The Pepper Pot').
Huer: the person at a point such as this keeping a lookout for the pilchard* shoals, upon which the local fishing communities depended. As soon as the shoals were seen (apparently enormous, they darkened the sea and so were visible from far off), the cry "Huer! Huer! Huer!" would go up and the whole town would rush into frantic but well-practised activity!
* Pilchard; a larger sardine as befits the increased size of the fish as it aged and progressed from southern waters. Today, the much smaller catches have been re-branded 'Cornish Sardines' as it was felt that 'pilchard' had the connotation of being a poor person's fish. I think this was a mistake!

Glad you like it, Fizgig. Many thanks!

Thank you Sonja!

Many thanks, BJW!