One of Sydney's lesser-known cultural attractions is one of its most interesting. The Powerhouse Museum presents exhibits on science and technology as well as fashion and decorative arts. Twelve permanent expositions range from a historic overview of space travel to an original model of the Strasbourg Astronomical Clock, which, at six minutes before the hour, performs a musical story from the Christian bible. Among the ornate dials is a display of the planets relationship to the sun as well as the position of the sun, moon, and stars over Sydney. An even more eclectic mix of visiting shows shuffles through the Powerhouse Museum; recent examples include a retrospective on a Beatles tour of Australia and a London exhibition on the history of underwear.