The Sydney Opera House is one of the world's most famous architectural landmarks, known for its dramatic 'sails' that stand out over the foreshore of Sydney Harbour. But the process of creating its iconic shape was fraught with challenges.
As one user has recalled on Reddit, the Sydney Opera House's shells proved to be impossible to make, until the architect realised that they could be produced as sections of a sphere. (See our pick of the famous buildings you should visit for inspiration).
