The Graveyard of Lost Species is an art installation hidden in the salt-marsh and mud-flats behind Leigh-on-Sea, the older fishing settlement at the western end of the modern city of Southend-on-Sea. It consists of a single decommissioned wooden bawley — the Souvenir — beached in the mud, her hull deeply carved with the names of fish, shellfish, birds, reptiles and marine plants that no longer live in the Thames Estuary.
The work, by the artist collective YoHa with local cocklers in 2016, will outlast no-one's lifetime — the boat is slowly subsiding into the mud and being colonised by samphire and barnacles. It is reached on foot from Leigh-on-Sea station along the seawall at low tide; check the tide tables first, and wear boots that you do not mind getting muddy.