The Sydney Opera House sits on Bennelong Point. This was once an island named after an Aboriginal leader who mediated between Indigenous Australians and British settlers.

Jørn Utzon's design, inspired by the segments of an orange, was deeply contentious: many Australians considered it extravagant and impractical. The budget blew from $7 million to $102 million, and Utzon fell out so badly with the government that he never returned to see it finished.

Beneath the roof's million Swedish-made tiles, the Concert Hall houses the world's largest mechanical tracker action organ. The roof itself doesn't attach to the building; it simply balances on its own weight.

VoiceMap's self-guided audio tours trace the Opera House's troubled origins, explore the unstable geology of Bennelong Point that nearly derailed construction, and connect the building to its harbour setting, from the convict island of Fort Denison to the residences of Kirribilli opposite.