ESTRAN Cite de la Mer is Dieppe's maritime museum, set close to the port that has shaped the town for centuries. Exhibits cover fishing, shipbuilding, navigation, marine life, and the ecology of the Channel coast, with enough hands-on material to make it useful for families.
It is a good rainy-day stop, but it also sharpens a sunny visit to the harbor. Dieppe is still a working maritime town, and the museum helps connect the boats, fish market, pebbled beach, and sea wall into one story.