When this triple-domed hangar was completed in 1917, its reinforced-concrete shell frame construction was unique in the world. Resembling a classic Bond-villain lair, the vast space was completely restored and opened to the public in 2012 as a fascinating maritime museum, filled with interactive displays. Highlights include exploring the cramped corridors of a 1930s naval submarine, and the icebreaker and minehunter ships moored outside.
