Milan’s Teatro alla Scala is perhaps the most famous opera house in the world, the Sydney Opera is one of the most distinctive and unique buildings considered a masterpiece of 20th-century architecture, and the Metropolitan is the largest house with a 38,000-seat capacity. The evolution of architectural styles from classical, beaux arts to more recent innovative styles employing the latest in engineering technology will be presented including locations in China, Dubai, and Azerbaijan. Videos of opera singers who have had their debuts at these theaters are presented as we explore the fantastic designs of opera houses throughout the world.