In which country would you find the Great Barrier Reef?

In which country would you find Wat Arun? In which country would you find Marina Bay Sands? In which country would you find the Chocolate Hills? In which country would you find the Hobbiton movie set? In which country would you find the Sheikh Zayed Grand Mosque? In which country would you find Wadi Rum? In which country would you find Persepolis? In which country would you find the Registan?