It is actually an open public green space just below the Sydney Harbour Bridge. We walked over the bridge from the rocky area of the city centre and then the elevator went straight down from the bridge to this Bradfield Park. From here, you can look up at the steel structure of the bridge from under the bridge, which is very impressive. You can also sit on the grass and enjoy the Sydney Opera House on the other side. It is 5 minutes from here to Moonshen Park.