Darling Harbour is correct.
We were visiting the Maritime Museum and I think that photo is from the HMAS Vampire.
Anybody that has not been the Australian National Maritime Museum is a fascinating place to visit.
Printable View
It is HMAS Vampire.
Next is:
what's the go with the dark shape in there...reinderr horns or an old saw blade...?
We may need a little more info
Looks like a massive Mallee Root
Its the root system of a River Red Gum.
I believe there are some 11 of these on display around the country, and usually referred to as another name.
This one is the largest. (probably too many hints), Where?
Do they refer to them as phoenix tree's?
The Black Stump, Paringa S.A.
Paringa SA