Keltenmuseum  The Keltenmuseum in Hallein near Salzburg contains major discoveries from the La Tene period of the Iron Age which come from burials in the area surrounding the nearby Hallein Salt Mine (Salzbergwerk Dürrnberg), at Dürrnberg. The Museum was founded in 1882 and was housed in the Bürgerspital. In 1930 it was moved into the Rathaus and from 1952 occupied a gateway of the town or stadt's fortifications. In 1970 the name was changed to Keltenmuseum and the museum was moved into the former Salt Offices (Saline Hallein) on the Pflegerplatz, which fronts the river Salzach. In 1980 the Museum staged a major exhibition "Die Kelten in Mitteleuropa" (The Celts in Central Europe), which demonstrated the wealth of discoveries that were being made at the Hallein. In 1993-4 the Austrian architect Heinz Tesar drew up plans for the conversion and extension of the Museum and on 1 January 2012 the Museum became a constituent part of Salzburg Museum. The building dates from the mid-18th century and in the Salt Office, now the top floor of the Museum, are a series of rooms, including the Prince's Chamber and Green Room, which have a series of 80 paintings by the artist Benedict Werkstötter, which illustrate the various processes of salt production. These were specially commissioned following a visit by the Prince- Bishop Sigismund von Schrattenbach in 1757. The Prince-Archbishops of Salzburg derived much of their wealth from the mining of salt at Hallein, although in 1732-4, 780 of the miners, who were protestants, were forced to leave Hallein because of their religious beliefs. In 1816, following the inclusion of Salzburgerland into the Habsburg Empire the office was amalgamated with the other Austrian salt production centres  The richest deposits of salt in central Europe are concentrated in at short distance from each other in the Eastern Alps, in the Salzburg and Salzkammergut areas. The mines of Hallstatt, Hallein-Durrnberg and Bad Reichenhall are close together, with those at Bad Aussee further to the east. Mining at Halstatt started in the later Bronze Age and reached its peak during the Hallstatt phase of the Iron Age (c750-480BC).