It is covered by a grass mound and could easily be overlooked.
another pic by Unukomo
It was in fact saved from quarrying in 1775, but the chamber itself was not discovered until it was excavated in 1837. Later, in 1916, a face was discovered carved into one of the capstones you can see when you look up. The face has been nicknamed Le Guardien du Tombeau – Guardian of the Tomb, but it is not known how long the carving has been there.
Yet another reason for another longer visit to Guernsey to go on my bucket list.