Built between 1888 and 1893, (the valve house was finished in 1887) it is part of Sydney's water supply. I went down there to learn to use my new camera and these are some of the photos. There are more photos at this link.
The valve house.
Some local details, there is a cycle way that for some totally bizarre reason is only open during daylight hours and a few wasps.
This channel brings the water to the dam from the dams on the Nepean River.