Schönbrunn Zoo (German: Tiergarten Schönbrunn; also simply called Vienna Zoo) is a 17-hectare (42-acre) zoo in the city of Vienna, Austria. Established in 1752, it is the world's oldest zoo still in operation.
To continue with the 60 year lease would make the zoo financially impossible to sustain, which would bring us to a crisis point and I strongly suggest we do not get to that point, Mr Blackman said. The institution is the world's oldest scientific zoo, having opened in 1828 as a research facility.