Château D'If Fortress On The Island Of If, Frioul Archipelago, Bay Of Marseille, Mediterranean Sea, France

The fortress was used as the location where Alain Charnier a.k.a. Frog One (Fernando Rey) meets Devereaux (Frédéric de Pasquale) to finalise the drugs shipment to the United States in the 1971 crime film The French Connection.
However, other locations have been used for Château d'If in the retelling of Dumas' The Count of Monte Cristo. In the 2002 adaptation starring Jim Caviezel, the château was represented by St. Mary's Tower on Comino, the smallest Maltese island. The cliff-top watchtower can be seen from the ferry crossing between Malta and Gozo.
It is also used in the Clive Cussler book Spartan Gold as a hiding place for artifacts.