The  Sydney Opera House was built in Sydney Harbor in Australia on a peninsula. Is the busiest hall in the world with over 3,000 events per year. It is open 24 hours a day and 363 days of the year. The Sydney Opera House was built in 1959-1973. The architect of the Sydney Opera House is Jorn Utzon. He was born on April 9,1918. He studied in the Academy of Arts in Copenhagen. Utzon grew up to be an engineer, but he unexpectedly won a competition for a new opera house in Sydney,Australia at the age of 38. It took him 14 years to finish the Sydney Opera House because of its overlapping roofs. When Jorn Utzon was finished building the  opera house he named it the Sydney Opera House.

The walls and ceilings of the Sydney Opera House are made out of laminated glass that is especially made in France. Two sheets of glass and one sheet of plastic was placed between the two sheets of glass unit which are stuck together. The buildings roofs are made out of fungus ceramic tiles. Pre cast concrete was used to build the ribs of the shells of the Sydney Opera House. Steel and tendon were not the only thing that was used to hold the pre cast concrete, the other thing that held the roof was epoxy resin. The Sydney Opera House was designed to be made out of pre stressed concrete like the Trans World Airline Building at Kennedy Airport in New York City. The materials were obtained from nearby.
   The interior of the Sydney Opera House is very pretty and is useful. It is the busiest hall in the world over 3,000 events happen there every year. The Sydney Opera House is used for performances such as ballet, opera and musical concerts. It had to rebuilt because it was about to become a place for gymnastics. There was not enough room for a gym so the building was kept as an opera house. The Sydney Opera House is very pretty from the inside. It looks like everything was made out of gold even the seats! It has more than twenty six thousand  (26,000) seats inside. The Sydney Opera House is a piece of art and architecture. If it were not for the architect, Jorn Utzon. It would have been a really big disaster without him!