Huge playground for kids and grown-ups with focus on physical exercising and enhancing coordination. There is no shade in the hot season.
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The Flower Gardens of Hirschstetten are run by the City of Vienna. The Gardening Department fosters their plants, which are then used in public gardens and parks. In the public section, several themed gardens (Chinese, Mexican, etc.) are installed; there is a preserved farm with petting zoo, an educational beehive, some turtles, owls and wild cats. For children, there is a big insect-themed playground available. Between Oct and March, only the orangerie is open for public. In front of the orangerie, there are popular Christmas and Easter markets during the weeks before the respective holidays.
Leopoldtower, Brachmühle, Schanze XX
Two high-rise apartment buildings (80 m and 100 m tall), built 2013-2015, mark the northeastern entrance to the city. The two massive buildings strike out in an otherwise suburbian jungle of low-rise shopping centres and family houses. On the ground floor is a medium-sized shopping mall (CityGate Shopping)
This is one of the biggest climbing gym in Vienna with 1200 mm² lead walls and 400 m² boulder walls. It is operated by the Viennese Naturfreunde. It hosted several IFSC Boulder Worldcups.
Seestadt
A new city area under construction. One of the biggest development areas in Europe, it will accommodate 20.000 inhabitants by 2025. 5,000 are living on the grounds of a former airfield. The modern architecture combines high living quality and state of the art building techniques and some notable buildings like the tallest wooden house with 85 m, which is under construction and some sophisticated green space and an artificial lake suitable for swimming.
The Gänsehäufel is the biggest open air beach in Vienna, and is operated by the city. You can lie on the grass, swim in the Old Danube or swimming pools including a wave basin and a water slide. There are several other activities available like rope climbing, stand up paddling and miniature golf, but don't expect the level of an upscale waterpark. There is a large nudist section available, too. Besides leisurely activities, the whole bath is noteable for its well-preserved functionalist 1950s buildings.
Vienna International Centre
This complex was completed in 1979, and is the seat for such international agencies as the IAEO, UNHCR, UNOV, and UNODC. General tours are offered for the public, as well as tours for those interested in human rights or arts.