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A plain brush box timber wall and concrete ceiling of the exterior of the concert hall at the Sydney Opera House on October 17, 2013 in Sydney, Australia. (Photo by Cameron Spencer/Getty Images) ( 185015460 )

A stage manager's office below the Joan Sutherland Theatre at the Sydney Opera House on September 20, 2013 in Sydney, Australia. (Photo by Cameron Spencer/Getty Images) ( 185015458 )

Lighting diagrams are displayed inside the Concert Hall control room in the Sydney Opera House on September 20, 2013 in Sydney, Australia. On October 20, 2013 the iconic Sydney Opera House will celebrate 40 years since it was officially opened by Queen Elizabeth II in 1973. (Photo by Cameron Spencer/Getty Images) ( 185015461 )

Tourists explore the forecourt of the Sydney Opera House on September 20, 2013 in Sydney, Australia. On October 20, 2013 the iconic Sydney Opera House will celebrate 40 years since it was officially opened by Queen Elizabeth II in 1973. (Photo by Cameron Spencer/Getty Images) ( 185015464 )

Detail of plain brush box timber used on the walls of the interior and exterior of the concert hall at the Sydney Opera House on September 20, 2013 in Sydney, Australia. Designed by Danish architect, Jorn Utzon, the famous landmark is the busiest performance centre in the world with over 1500 performances per year and serves as home to Opera Australia, The Australian Ballet, the Sydney Theatre Company and the Sydney Symphony Orchestra. (Photo by Cameron Spencer/Getty Images) ( 185015465 )

Detail of a staircase up to the box office in the Sydney Opera House on September 20, 2013 in Sydney, Australia. (Photo by Cameron Spencer/Getty Images) ( 185015469 )

Detail of plain brush box timber used on the walls of the interior and exterior of the concert hall at the Sydney Opera House on September 20, 2013 in Sydney, Australia. (Photo by Cameron Spencer/Getty Images) ( 185015474 )

A Sydney Ferry passes by windows of the Sydney Opera House on September 20, 2013 in Sydney, Australia. On October 20, 2013 the iconic Sydney Opera House will celebrate 40 years since it was officially opened by Queen Elizabeth II in 1973. (Photo by Cameron Spencer/Getty Images) ( 185015472 )

Detail of the ceiling and windows inside the Sydney Opera House on October 17, 2013 in Sydney, Australia. On October 20, 2013 the iconic Sydney Opera House will celebrate 40 years since it was officially opened by Queen Elizabeth II in 1973. (Photo by Cameron Spencer/Getty Images) ( 185015475 )

A tourist takes a photograph inside the Sydney Opera House on September 20, 2013 in Sydney, Australia. On October 20, 2013 the iconic Sydney Opera House will celebrate 40 years since it was officially opened by Queen Elizabeth II in 1973. (Photo by Cameron Spencer/Getty Images) ( 185015477 )

Tourists walk through a foyer at the Sydney Opera House on September 26, 2013 in Sydney, Australia. On October 20, 2013 the iconic Sydney Opera House will celebrate 40 years since it was officially opened by Queen Elizabeth II in 1973.(Photo by Cameron Spencer/Getty Images) ( 185015479 )

A tour guide presents to tourists at the Sydney Opera House on September 26, 2013 in Sydney, Australia. (Photo by Cameron Spencer/Getty Images) ( 185015478 )

A tour guide talks to tourists at the Sydney Opera House on September 26, 2013 in Sydney, Australia.(Photo by Cameron Spencer/Getty Images) ( 185015481 )

Costumes are seen backstage of the Dame Joan Sutherland Theatre in the Sydney Opera House on October 17, 2013 in Sydney, Australia. (Photo by Cameron Spencer/Getty Images) ( 185015482 )

A catwalk containing power and lighting pipelines servicing the Concert Hall at the Sydney Opera House on September 20, 2013 in Sydney, Australia. On October 20, 2013 the iconic Sydney Opera House will celebrate 40 years since it was officially opened by Queen Elizabeth II in 1973. (Photo by Cameron Spencer/Getty Images) ( 185015484 )

The Grand Organ containing 10,244 pipes, 205 stops and five manuals is seen inside the concert hall at the Sydney Opera House on September 20, 2013 in Sydney, Australia. (Photo by Cameron Spencer/Getty Images) ( 185015485 )

Detail of the architecture on the exterior of the concert hall at the Sydney Opera House on October 17, 2013 in Sydney, Australia. (Photo by Cameron Spencer/Getty Images) ( 185015489 )

Power cords and electrical equipment are seen in the Dame Joan Sutherland Theatre dock two floors below stage level at the Sydney Opera House on October 17, 2013 in Sydney, Australia. (Photo by Cameron Spencer/Getty Images) ( 185015488 )

The original east glass wall winch used for construction remains on location in the sails of the Sydney Opera House on September 20, 2013 in Sydney, Australia. (Photo by Cameron Spencer/Getty Images) ( 185015490 )

The acoustic rings called the 'clouds' float above the stage in the concert hall at the Sydney Opera House on September 20, 2013 in Sydney, Australia. (Photo by Cameron Spencer/Getty Images) ( 185015495 )

Detail of the Grand Organ containing 10,244 pipes, 205 stops and five manuals is seen inside the concert hall at the Sydney Opera House on September 20, 2013 in Sydney, Australia. (Photo by Cameron Spencer/Getty Images) ( 185015496 )

Detail of plain brush box timber used on the walls of the interior and exterior of the concert hall at the Sydney Opera House on September 20, 2013 in Sydney, Australia. On October 20, 2013 the iconic Sydney Opera House will celebrate 40 years since it was officially opened by Queen Elizabeth II in 1973. (Photo by Cameron Spencer/Getty Images) ( 185015491 )

A staff member relaxes in the green room looking out at Sydney Harbour from inside the Sydney Opera House on September 20, 2013 in Sydney, Australia. On October 20, 2013 the iconic Sydney Opera House will celebrate 40 years since it was officially opened by Queen Elizabeth II in 1973. Designed by Danish architect, Jorn Utzon, the famous landmark is the busiest performance centre in the world with over 1500 performances per year and serves as home to Opera Australia, The Australian Ballet, the Sydney Theatre Company and the Sydney Symphony Orchestra. Utzon famously quit the project following delays and cost blow-outs, but the building was completed, ten years late and fourteen times over budget, without any mention of the architect. Thirty years later, Jorn Utzon was awarded the Pritzker Prize and the Opera House was declared 'one of the great iconic buildings of the 20th century'. In 2007 it was declared a UNESCO World Heritage Site. (Photo by Cameron Spencer/Getty Images) ( 185015497 )

A tour guide talks to tourists at the Sydney Opera House on September 26, 2013 in Sydney, Australia. (Photo by Cameron Spencer/Getty Images) ( 185015499 )

A pianist rehearses on a grand piano in the concert hall at the Sydney Opera House on September 20, 2013 in Sydney, Australia. (Photo by Cameron Spencer/Getty Images) ( 185015498 )

Tourists watch an audio-visual presentation on the design and history of the Sydney Opera House at the Sydney Opera House on September 26, 2013 in Sydney, Australia. (Photo by Cameron Spencer/Getty Images) ( 185015501 )

Detail of the Sails over the Joan Sutherland Theatre at the Sydney Opera House on September 20, 2013 in Sydney, Australia. On October 20, 2013 the iconic Sydney Opera House will celebrate 40 years since it was officially opened by Queen Elizabeth II in 1973. (Photo by Cameron Spencer/Getty Images) ( 185015504 )

Detail of the back of the Grand Organ containing 10,244 pipes, 205 stops and five manuals is seen inside the concert hall at the Sydney Opera House on September 20, 2013 in Sydney, Australia. (Photo by Cameron Spencer/Getty Images) ( 185015506 )

Wigs are seen backstage of the Dame Joan Sutherland Theatre in the Sydney Opera House on October 17, 2013 in Sydney, Australia. (Photo by Cameron Spencer/Getty Images) ( 185015509 )

The lifts in the Dame Joan Sutherland Theatre dock are seen two floors below stage level at the Sydney Opera House on October 17, 2013 in Sydney, Australia. On September 20, 2013 the iconic Sydney Opera House will celebrate 40 years since it was officially opened by Queen Elizabeth II in 1973. (Photo by Cameron Spencer/Getty Images) ( 185015510 )

The concert hall is seen from the audio-visual control room inside the Sydney Opera House on September 20, 2013 in Sydney, Australia. (Photo by Cameron Spencer/Getty Images) ( 185015549 )

The ceiling of the Concert Hall paneled with white birch is seen inside the Sydney Opera House on September 20, 2013 in Sydney, Australia. On October 20, 2013 the iconic Sydney Opera House will celebrate 40 years since it was officially opened by Queen Elizabeth II in 1973. (Photo by Cameron Spencer/Getty Images) ( 185015544 )

Detail of the back of the Grand Organ containing 10,244 pipes, 205 stops and five manuals is seen inside the concert hall at the Sydney Opera House on September 20, 2013 in Sydney, Australia. (Photo by Cameron Spencer/Getty Images) ( 185015551 )

Structural detail underneath the forecourt staircase at the Sydney Opera House on September 20, 2013 in Sydney, Australia. On October 20, 2013 the iconic Sydney Opera House will celebrate 40 years since it was officially opened by Queen Elizabeth II in 1973. (Photo by Cameron Spencer/Getty Images) ( 185015554 )