The Botany Pump Station supplied water to the city of Sydney from 1859 to 1886. It drew water from the Botany Swamps which now are more commonly know as the Mill and Engine Pond. Don’t you love that name, sounds really industrial.
These days, the Botany pumping station is a bit of a relic and is situated to the south-east of Sydney Airport. In 1896, the machinery and boilers were dismantled leaving the chimney stack in tact (have a look at its glory here). When the Airport was developed, the stack was considered a hazard to aircraft and was pulled down to the level you seen now in the photo above.
Cheers for now.