Not only is Château d’If an historically important fortress and, later, prison, but it is also famous for being the prison is Alexandre Dumas’s iconic novel, The Count of Monte Cristo. Due to its historic and cultural significance to the city, as well as its location in the beautiful waters off the coast of France, taking a boat trip to see for yourself the mysteries of Château d’If is one of the most memorable things to do whilst in Marseille.