Can you still find hidden places in Sydney? Maybe not, however in some cases you can still find hidden angles from where to make a photo.
Bare Island became very famous few years ago when the final fight of the movie Mission Impossible was filmed. Now it is the place for wedding photography and some memorable shots. Unfortunately it is closed during the magic hours, sunset and sunrise. Go around the bridge and look for a different angle, you will find some spectacular views (zoom in the map for one of them).
I will be in Sydney for a 2 days shooting. Drop me a message and we can meet 😀