burial carving celtic churchyard Cornish cornwall dead death decease England english gravestone graveyard Great Britain headstone lichen masonry memorial old religion religious remembrance stone symbol beach cliffs coastline cove inlet natural nature ocean rocks sand sandy sea sheltered shore spring tide water waves wild bay hill low tide river flowers garden Michael mount national trust rockery saint slope St. Michael's Mount steep boulders cliff granite granitic rocky stones surf view blue enjoyment family fun holiday holidaymakers leisure pleasure vacation