The Sydney Opera House is a very famous building in the world. It has become Sydney's best-known landmark and international symbol. The Opera House with a " sailing roof" was designed by a famous Danish architect  ,Utzon. The base for the building was started in 1959, years before the designs were finished. Utzon spent four years designing the Opera House. In 1962, the designs were finalized   and the construction began. In 1967, they started the decoration inside. It took 14 years in total to build the Opera House. Queen Elizabeth II officially opened it on October 20th, 1973. The Sydney Opera House cost around $100 million and was paid for by the public 6,225 square meters of glass was used to build it. The Opera House includes 1,000 rooms. It is 185 meters long and 120 meters wide. The building's roof sections weigh about 15 tons. Each year, this fantastic building attracts 200,000 tourists to come for a visit or enjoy events in it. The Opera House reaches out into the harbour  . It is amazing and unforgettable, offering people a strong sense of beauty. Building the Sydney Opera House lasted  _  .
from 1959 to 1973 from 1962 to 1973 from 1959 to 1967 from 1962 to 1967