The fort is really two parts. The outside is free and the inside exhibits are paid. You can…read morepurchase and audio guide for both the inside and outside parts. Most of the inside exhibitions are in the new black building that you can get to with a bridge connecting the fort to the building. It was a mix of history about the fort, Marseille, and the mediterranean. At the time I was here they had a special exhibition too. It did had an amazing view of the harbor and the sea!