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Photo: Manfred Werner - Tsui, CC BY-SA 3.0 via Wikimedia Commons
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.
© OpenStreetMap contributors
Huge playground for kids and grown-ups with focus on physical exercising and enhancing coordination. There is no shade in the hot season.
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.
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)
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.
One of the bigger social housing projects of the "Red Vienna", the Goethehof was built 1928-1930 as living blocks (~700 apartments) surrounding a courtyard. The architectural style is modern-functionalist with some art déco-elements. As all of the housing projects of the social democratic Vienna (1919-1933), it was a quantum leap in housing quality for the working class. During the Austrian Civil War (1934) it was one of the strongholds of the resistance against Austro-fascism and even suffered the one and only air-raid during this conflict.