Pierre Longue
Menhir · Batz-sur-Mer
Museum
Le Grand Blockhaus
The Grand Blockhaus or Museum of the pocket of Saint-Nazaire, located in the commune of Batz-sur-Mer, in the French department of the Loire-Atlantique, is a former bunker of the Atlantic wall transformed into a museum recreating a German command post during the Second World War and tracing the history of the pocket of Saint-Nazaire.