Directly on the Flensburg Fjord lies the Naval School Mürwik, one of the most distinctive buildings in the city. Due to its red brick facade, the historic training facility of the German Navy is also known as the "Red Castle by the Sea." The historic architecture, the location by the water, and the maritime history make the Naval School a special Flensburg photo motif.

The Naval School Mürwik is not open to the public. Visits are possible only on special visitor days and events. Opening hours and dates are announced for each event. A valid personal ID is generally required for access on visitor days.

With doors open, visitors can explore parts of the historic main building, the tower building with views over Flensburg, the planetarium, and the Military History Training Center, depending on the event. Guided tours may also be offered.

The Military History Collection in the former commander's villa of the Naval School Mürwik is currently not regularly accessible to the public due to renovation work.