This broken window belongs to an outbuilding at Strickland House in Sydney. The main house dates to the 1850s and has stunning views over Sydney harbour to the city, bridge and opera house. When it ceased to be a private house, the buildings and grounds became a hospital in 1915, and in 1994 the grounds became a public park.
The main house is open to the public only one day a year, during the National Trust’s Heritage Festival. I’ve never yet managed to get inside! This year, the house won’t be open due to conservation work (and judging from this window, it’s necessary!). Oh well, maybe next year.