There are few more lasting artefacts than the markers surveyors use to delineate the boundaries of land. In the early to mid nineteenth century, large carved stones were used to delineate the boundaries of Sydney Town while cast iron posts were used to mark the original wards of the City of Sydney.
Originally installed on the south-west corner of the intersection of Cleveland Street with South Dowling Street (as now named), Redfern, the sixth boundary stone has been moved many times and is now located in the north-west corner of
Moore ParkSouth, on the east side of Southern Cross Drive. It is in poor condition but, based on the exposed dimensions, it must weigh at least 12 hundredweight (about 600 kilograms).
Major General Sir
Richard Bourke arrived in Sydney in 1831 to become Governor and, in the following year, he commenced actions to have Sydney declared a town. At that time, Sydney lay to the south of
Port Jackson, between
Blackwattle Bay and
Rushcutters Bay, so the northern boundary was the shoreline with a total distance of about 18 kilometres (11 miles). His western, southern and eastern boundaries are marked on maps by Baker
[1] & Wells
[2] and were essentially straight lines making up a distance of 5.6 kilometres (3.5 miles) – the southern boundary being the present day Cleveland Street. Bourke had stones installed at the corners of these town boundaries, only eight being needed. On Baker's map, the position of the boundary stones is labelled with an open circle. The stones are more clearly shown by
MacDonald [3] even though, in 1930, he was only able to find three of them.
http://dictionaryofsydney.org/entry/sydneys_boundary_markers
Less than a decade after the Sydney Town boundary stones were installed, Governor Gipps proclaimed Sydney to be a city [7] and had an unknown number of cast iron boundary posts erected to mark the corners and bends of the boundaries of the wards as defined in 1842. These boundary posts were made by the firm of PN Russell 
from cast iron and reputedly weighed about 266 pounds (120 kilograms) [9]. All were embossed on the rear side with the date of the incorporation of the City of Sydney – 1842 – and on the front with an empty shield with the ward name above and below the words 'WARD', 'Hosking' and 'Mayor', plus a unique identity number (how those numbers were actually allocated is not known). Where are they now? In 2011, only four boundary posts were traced and only three remain on streets. One of these three is still in its original location on the north-west corner of the intersection of Cleveland Street and South Dowling Street.