The Vienna National Opera House is one of the world's most famous opera houses and one of the world's four major opera houses. It is known as the World Opera Center and is also the main symbol of Vienna. The Vienna National Opera House was founded in 1861 and completed in eight years. It is situated on the Circle Avenue of the Old City of Vienna. It was originally the Royal Palace Theatre. The opening ceremony was completed on May 15, 1869. The first performance was Mozart's opera "Tang 183; Juan", which opened a brilliant prelude. In 1918, the Palace Theatre became state-owned, known as the National Opera House. At the end of World War II, the Vienna National Opera House was severely damaged by the large-scale bombing of Germany and Austria by the Anglo-American Allied Forces, leaving only a few ruins. After the war, the reconstruction of the opera house took eight years and cost $100 million. On November 5, 1955, it reopened and performed Beethoven's opera "Federio" to celebrate the second spring of the opera house. In 300 performances a year, opera and ballet repeats every day. In July and August, the opera house closed and the band (Vienna Philharmonic Orchestra) went to Salzburg to attend the music festival. The Opera House is located at the crossroads of downtown areas. It's hard to get a panoramic view at close range. We only visited the exterior.