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Photo: Extrawurst, CC BY-SA 3.0 via Wikimedia Commons
Austria's biggest stadium (capacity 50.000) is frequently hosting major sports events like soccer (Austrian National Squad; Rapid Wien; Euro League and Champions League), track-and-fields, as well as the occasional concert (e.g. Bon Jovi, Helene Fischer). Vast training compound adjacent.
Ernst-Happel-Stadion, known as Praterstadion until 1992, is a football stadium in Leopoldstadt, the 2nd district of Austria's capital Vienna. With 50,865 seats, it is the largest stadium in Austria. It was built between 1929 and 1931 for the second Workers' Olympiad to the design of German architect Otto Ernst Schweizer. The stadium was renamed in honour of Austrian footballer Ernst Happel following his death in 1992. The stadium hosted seven games in UEFA Euro 2008, including the final which saw Spain triumph over Germany.
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Krieau Race Track
In use since 1878, this race track is used for harness racing, hosting regional, national, and international races. The track schedule is available online.
Neubau WU / Wirtschafts Universität Wien
This stunning new campus opened in 2013, with buildings designed by international architecture firms from Spain, the UK, Germany, Japan, and Austria. The star of the campus is theLibrary & Learning Center, designed by British-Iraqi architect Zaha Hadid.
Institute of Atomic and Subatomic Physics
The 250 kW TRIGA Mark II reactor in the Viennese Prater started operation in 1962. The reactor is a training ground for International Atomic Energy Agency (IAEA) inspectors and neighbouring countries. The Atominstitut offers guided tours for groups upon previous registration.
Run by Reed Exhibitions, who operate fairgrounds throughout Austria, Vienna's fairgrounds are not as known for major events as the ones in Frankfurt, Munich or Hannover, but still play host to many events important to the Austrian, Central European and German-speaking markets. The fairgrounds were completely reconstructed at the turn of the millennium and a new rotunda with a part of the historic Messeturm lattice tower placed on top was built at the main entrance, providing a beacon visible from afar.The fairgrounds are quite large, with four main halls, a congress centre and three entrances, close to U-Bahn stations Messe/Prater and Krieau on the U2. If there is an interesting event there, this may serve as a rainy-day alternative for the Prater amusement park. Most events happen January through May and October/November. Check the calendar if the event is of interest and open to the public.
Circus and Clown Museum
This unusual museum houses a collection of props and costumes, with rotating exhibits.
This year-round amusement park (map available here was established in the late 18th century, and is most famous for its Riesenrad (see listing below). The park also includes standard fun rides as well as a Madame Tussauds wax works cabinet and the Liliputbahn (a narrow-gauge railroad). Possibly the weirdest attraction though is the Kugelmugel (Antifaschismusplatz 2), a spherical house (diameter 7.68m) that, after failing to get a planning permit, declared independence from Austria. First built elsewhere and carted off to the Prater by Austrian authorities, it now sits uninhabited and fenced off with barbed wire.