The key attraction of Marseille ... 5) to get in. The boats leave from the Vieux Port. Look for the 'Frioul-If-Express' sign.

Château d'If is a 16th-century fortress, commissioned by King Francois I, set atop the smallest island in the Frioul archipelago less than a mile from Marseille ... 10 a.m. to 5 p.m. From ...

Built in 1660 by Louis XIV, Fort Saint-Jean is a well-preserved fortress guarding Marseille at the entrance ... From May 2 to July 7 and Sept. 4 to Nov. 5, it's open from 11 a.m. to 7 p.m. From ...