One of the oldest buildings of Suomenlinna. It was the home of the commandant of the fortress until 1850s. The interior museum, named after the founder of the fortress, has the exhibition Augustin Ehrensvärd – The Man and His Times, which shows portraits, artefacts, models of ships and oil paintings by Elias Martin. Closed during winter season. During 4.4.-26.4 Sat-Sun 11-16, during 2.5.-31.5. Mon-Sun 10-16, during 1.6.-31.8. Mon-Sun 10-17.