Heaven and hell are sometimes much closer together than one would biblically believe. And the devil is not always in the details, sometimes also in the big historical picture. A particularly vivid example can be found in deeper Transdanubia, not far from the so-called Seestadt Aspern. There is still water, an innocent piece of nature, as one could easily think, girdled contemplatively by reeds, water lilies in the middle: the sky pond. On the part of the Viennese city administration, however, the Himmelteich area is known under a rather infernal attribution: namely as "Altlast W3". In the municipal waste portal it reads as follows: “A former gravel pit was filled with approx. 150,000 m3 of household waste and construction rubble by 1970.” The associated “considerable risk to the groundwater” was averted between 1991 and 2001: among other things by “clearing the deposits and the contaminated subsoil ”. The redevelopment, in turn, was followed by the construction of a biotope, which we encounter today as if it had never been otherwise: so biotopic that it has now even been accredited as a natural monument. So much for the ultimately pleasant side of the Himmelteich story.