Fort Denison on the Harbour - Australia Tourist GuidePhoto: Small but formidable. This little unsinkable fort, with its tower of 20 foot thick walls and cannons would have posed a serious threat to any sailing ship of the day.You can take a tour of this little fort on Sydney Harbour from Circular Quay. You can even enjoy breakfast, lunch or dinner here at the Café, unlike pirates and wannabee conquerers of earlier years. The Fort was built by convict labour on the small rocky reef located here, originally used as a place of punishment for convicts who had transgressed after their arrival at the Colony. Called Pinchgut Island, prisoners were left here with absolute minimun rations for their time of punishement. See the City Central Map showing Circular Quay, The Opera House and The Rocks Map of Sydney CBD. Description: Part of the early defences of Sydney Harbour. Find and Book Sydney Australia Hotels Hotels in Sydney. | 
