This is Sydney's landmark building, famous for its shell-shaped roof. It is said that the outside facade of the roof is tiles imported from Italy to prevent seabirds from staying on it and bird droppings from eroding the walls. Over the years, the whole outside and inside should remain basically intact. This building is a nightmare for the builders, because he has no beams, so its whole shell-like roof is supported by steel beams inside. When it was built, the budget broke through a lot, and the architect could not bear the pressure to leave Australia and never came back. The whole building was so magnificent that he could feel his magnificent posture whether standing in Sydney Bay or at the foot of the Opera House. Looking at the bridge and the whole Sydney Bay from here is also very beautiful. It has time to walk around.