One of the most colourful figures associated with Tristan was Guy Éder de la Fontenelle, a rebel-bandit who took possession of the island in 1595.
Le Guillou de Penanros developed the harbour and the sardine processing plant on the island, the first of its kind.
The sardine industry developed as Douarnenez' principal economic activity in the late 19th and early 20th centuries.
He built the rotunda and the Chapelle des Aviateurs commemorating the first transatlantic flight from Europe to the United States by Dieudonné Costes and Maurice Bellonte in September 1930.
Rabbits and lizards abound on the island, as do a wide variety of seabirds, especially cormorants, guillemots and herons.
A large orchard is located in the southern part of the island, in addition to a tropical garden with a giant bamboo plantation, magnolia and fuchsia.