The current Sydney Observatory building on Observatory Hill was completed in 1858 by English astronomer and clergyman William Scott. Also on Observatory Hill is the old Fort Street School, converted from the old Military Hospital at Fort Phillip in the 1850s. Fort Street School incorporated the first government secondary school in Australia, and after the secondary school moved out in 1975, its building has housed the National Trust of Australia; the primary school remains nearby in a separate, heritage listed, building.