Donauinselfest: The World's Most Crowded Music Festival • Donauinselfest: Crowded Music Festival • Discover the most crowded music festival in the world, Donauinselfest in Vienna, Austria. With millions of visitors and a diverse lineup of musical genres, this free open-air festival is a must-visit for music lovers. Experience the rich music and culture against the backdrop of the beautiful Danube Island.
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