The Opera House, the Harbour Bridge and beaches within the city.
Take the ferry from Circular Quay to Manly for the best view of the harbour, and walk the coastal path from Bondi to Coogee.
At dusk, the sails of the Opera House glow under the Harbour Bridge; climb the bridge or watch a show inside.
Photo: Benh LIEU SONG (Flickr), CC BY-SA 4.0, Wikimedia Commons (https://commons.wikimedia.org/wiki/File:Sydney_Opera_House_and_Harbour_Bridge_Dusk_(3)_2019-06-21.jpg)