Image taken 45minutes before sunrise.
Park is illuminated on either side by sodium lights. As these lights are monochromatic, no colour detail other than the sodium light is recorded. Sky just starting to lighten.

Len flare from facing into the light with lights just out of shot. El cheapo UV filter exaggerates the effect.

from http://www.randwickhistoricalsociety.org.au/watcht.htm

Macquarie Watchtower, also known as the Barrack Tower, was probably built around 1821 or 1822. It is the oldest building in the City of Randwick and one of the heritage sites in NSW.

It was originally staffed by a few soldiers who were presumably tasked to be a lookout for problems that arose in what was in the 1820s an isolated back dooor to the Colony.

The National Parks and Wildlife Service commissioned a major restoration project in 2010 after these images were taken.