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Across the world, a single bold piece of architecture devoted entirely to opera turned a city into a cultural landmark. Oslo's floating marble roof lets visitors walk onto the building itself, while Sydney's shell-like sails became the defining image of an entire nation. In Muscat, the opera house opened in 2011 as the Gulf's first, signaling a new cultural ambition, and Manaus's gilded jungle theatre once brought European opera deep into the Amazon rainforest. Guangzhou's curving riverside hall, designed by Zaha Hadid, shows how the form keeps reinventing itself in the twenty-first century.