This magnificent curved building stands, striking and unmissable, in the suburban 23rd district on the outskirts of Vienna. It’s a curiously futuristic, sprawling and intimidating structure, designed in the 1970s by progressive Austrian architect Harry Glück. This social housing complex was built with the radical idea of creating homes for the poor, with all the benefits that the wealthy favour. Inside this incredible structure (it’s akin to a small town) are all the necessary amenities, including shops and a doctors’ surgery, and there’s even a swimming pool on the roof. Many thousands of people reside in Alt-Erlaa, and it is seen as one of Vienna’s most successful social housing estates.