The city is dominated dy the harbor which people have described in the world there are three things thatyou must not-and indeed cannot-miss first there is sydney harbor bridge one of the largest single-arch bridges in the world second the sydney opera house is a famous landmark that most visitors greatly anticipate seeing finally do not miss fort denison where prisones were kept in solitary confinement for. Days on a diet of bread and water the best way to get around is by is by boat or hydrofoil both. of which have regular services leaving from circular quay if you prefer to do things at your own pace why not hire one of the many boats available for this purpose