Observatory Hill is located on a hillside that is not too high. It is not a place to overlook the city. It is indeed a commanding height for the rocky area to enjoy the harbour view. A few huge ancient trees and lawns on the park have become a place for locals to exercise and relax, and it is also a place to take wedding photos. The park has an observation deck, a fort and an observatory. This is the oldest observatory in Australia. It is open to the public during the day and will organize some stargazing activities at night. There are projects provided in Chinese. Address: 1001 Upper Fort St, Millers Point NSW 2000 Transportation: Follow Argyle st Street in the rock area and pass through the Argyle Cut tunnel. Walk along the indicator for a few minutes to the top of the mountain Observatory Open hours: daytime 10:00-17:00; night tour weekday 18:30-20:00, Friday and Saturday 21:00-22:30, Chinese group on the first Sunday of each month