Built in 1858, the Observatory operated until the 1980s and gained an international reputation for its work. This elegant, sandstone complex is now part of the Powerhouse Museum. The permanent exhibition, by the light of the southern stars', is highly informative while there is also a temporary exhibition programme and associated events. On a clear night, the stars and planets are visible through a telescope and can be accessed via guided tours every evening throughout the year. Bookings are essential for this family-oriented activity. Admission price varies depending on time of day.