Graz-Karlau Prison serial killer Wolfgang Ott; and the terrorist Tawfik Ben Chaovali, who was involved in the Rome and Vienna airport attacks. Graz-Karlau Prison Graz-Karlau Prison () is located in Gries, the 5th district of the city of Graz, capital of the Austrian state of Styria. With a capacity of 552 inmates, Graz-Karlau is the third largest prison in Austria. Built between 1584 and 1590 in late Renaissance style to designs by Antonio Tade and Antonio Marmoro, it was used as a summer hunting residence for Archduke Karl II of Austria. Originally, it was called "Dobel Castle". The German word "Dobel" is
Trams in Graz gauge and became part of the tram network. The resulting long outer section of tram route 1 still retains many light railway features, with its off-street routing and long stretches of single track. The Graz tram network reached a peak in 1950. Growing car ownership, and the growth of residential areas in outer reaches of the city not served by the trams, lead to a fall in tram usage and eventually, after 1950, the closure of several tram routes. The city introduced trolleybuses in 1941 to serve the outer areas of the city, but these were replaced by motor buses