Observatory Park is located in the heart of the Sydney central business district, City of Sydney, New South Wales, Australia. It is near the Harbour Bridge and is bounded by Kent Street, Watson Road, Upper Fort Street and Bradfield Highway, Millers Point. Its history dates back to 1796 when it was used as the site of the first windmill in the colony, when it was known as Windmill Hill. It is also the site of a number of historical buildings including the historic Sydney Observatory (thus often referred to as Observatory Hill), the Signal Station, the remains of Fort Philip, the National Trust Centre (formerly Fort Street High School) and a rotunda which is used for weddings.