From a local history perspective, no.2 battery was likely at Dawes Point, (Sydney), so historically that would be a significant site, 1800s records may refer to Lower George St if seeking Wm Colston.
If standing there today, you will see the built environment including a busy commercial harbour, Opera House, Harbour Bridge, Cadman's Cottage, Admiralty House, Luna Park, Campbells Wharf and Warehouses, The Rocks, Millers Point, and of course, Dawes Point. But you will also see the convergence of the waters of the rivers and creeks entering The Harbour, just as the Aboriginal Peoples did for generations upon generations, just as did the convicts, marines, governor and his admin team and the transport ships's crew in January 1788.
ADD
See #25 ... convergence is wrong word. CONFLUENCE is better option. 6.23pm NSW time
JM