This itinerary covers the essential attractions of Cherbourg in one full day. Start at Place du Général-de-Gaulle with its elegant theater and Mouchel Fountain, then visit the Thomas Henry Museum featuring Normandy's third-largest fine arts collection. The afternoon is dedicated to La Cité de la Mer, housed in a stunning Art Deco maritime station, where you can explore Europe's deepest aquarium and the legendary Le Redoutable nuclear submarine. Note that the Thomas Henry Museum is closed on Mondays and has a lunch break from 12:30 to 14:00 on weekdays. Children under 5 cannot visit the submarine for safety reasons.