The most likely hypothesis of the origin of fish bones, given the structure of the network, is a military use, or at minimum, shelter and storage.

They were excavated during the construction of the royal citadel Saint Sebastian, symbol of royal authority against Protestants during the reign of Charles IX in 1564. The citadel was destroyed 20 years after the reign of Henry III. It will write up an order for its destruction, to avoid ridicule.

On the roof of the Basilica of Fourviere. In the background, a kind of Eiffel tower, a civilian and military radio relay.

Built in 1522, the castle of the bull is a defensive fortification. It was upgraded by Vauban in 1700. The work took about 45 years. The castle of the bull has never been a major military role. It has been used as a prison for a long time. In 1914 he was classified a historical monument. This does not prevent the Germans using it as DCA during the Second World War. After the war, the sailing school Morlaix settles for 20 years. Then in 1980, it is abandoned. Fishermen love to come and make a fire to eat but they ransacked the wood fittings. Today it is finally restored and visited by the public.