Do you know what the iconic “shells” of the Sydney Opera House are made of? The answer: Precast concrete and ceramic tiles! Swipe to see close-ups of the roof. This building is a prime example of how Modernist architects used innovative materials. Hidden in Sydney's harbor are structural concrete piers that support the opera house broadwalk. These pose an interesting challenge for engineers. Exposed to water and tide fluctuations, the concrete piers could deteriorate. Specialists are using a method called cathodic protection, which runs an electric current through the piers' reinforcing steel to limit deterioration. Cool, right? Getty works to conserve modern architecture around the world. Learn more about the conservation of the Sydney Opera House at the #linkinbio _ This July we're highlighting modern architecture. Journey through buildings, cities, zoos and more! #gettymodernarchitecture