Sydney Observatory
A hill that was a windmill site, an unfinished colonial fort, and a signal station — and still points a 150-year-old telescope at the sky every evening.
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Built between 1857 and 1859, this working museum on Observatory Hill carries four distinct pasts: windmill, defence fort (never finished), semaphore station, and time ball station. Evening visitors can observe through the modern 40 cm Schmidt-Cassegrain telescope or the 29 cm refractor built in 1874 — the oldest telescope in Australia in regular use. The site was added to the NSW State Heritage Register in 2000.
What to look for
- The 1874 refractor telescope, 29 cm aperture — the oldest in Australia still in regular use
- The modern 40 cm Schmidt-Cassegrain telescope used for evening stargazing sessions
- The layered site history: the hill was called Windmill Hill in the 1790s, then Fort Phillip after 1804 when Governor King ordered a citadel that was never completed
Evening telescope sessions are the main draw — book ahead as walk-ins may not get access to the telescopes; the hill is at Upper Fort Street, Millers Point.
Sydney Observatory is one of 23 sights worth the detour in Sydney, all bundled offline in Voyage GO — download the Sydney pack and it sits on your map with no signal, filling your travel passport the moment you walk past.
More to see in Sydney
- Sydney Opera HouseJørn Utzon won the design competition in 1957, directed construction, then resigned before it ever opened — Queen Elizabeth II cut the ribbon on 20 October 1973.
- Sydney Harbour BridgeWalk the arch of the world's tallest steel bridge — nicknamed "the Coathanger" — with Sydney Harbour spread out below you and the arch top rising 134 m above the water.
- Accor StadiumBuilt in 1999 for A$690 million, this was the largest Olympic stadium ever constructed — originally squeezing in 115,000 people.
- Sydney Tower EyeAt 309 m above the CBD, this is the highest observation deck in the Southern Hemisphere by deck elevation — clearing Auckland's Sky Tower by nearly 30 m.
- Australian MuseumThe world's fifth oldest natural history museum has been in Sydney since 1827 — older than the colony could really afford it.
- Taronga ZooFive thousand animals on the Mosman shore — and the Sydney skyline watches from across the water.