“Every Tuesday, follow the guide from the port of Bourg classified “”Old Village”” and walk along the ramparts, discover the covered laundry and enter one of the oil tanks built during the Second World War, directly in the cliffs of the city. Accessible only with a guide, you will be impressed by this huge troglodyte cathedral made of bricks and concrete. It’s unpublished in Gironde, and it’s in Bourg!