A mechanically ventilated underground tunnel complex that lies 40m beneath the Upper Barrakka Gardens, it housed Britain's top secret command in Malta during WWII and remained in use until 1977. Lovingly restored in 2009, the rooms are laid out as they would have been, staffed by waxwork figures, and provide a fascinating behind-the-scenes glimpse. Reach here by going to the Saluting Battery in the Upper Barrakka Gardens – the staff there will direct you.
