Ludwig of Bavaria
In 1906, Bing installed electric lights and turned the cavern into a tourist attraction. He hired Konrad Arndt, who had worked on the initial excavations, as the site's overseer, and his niece, the enthusiastic amateur spelunker Olga Hirsch, worked as a guide. In 1909 a movie crew toured the cave and the resultant film was screened at the "cinematograph salon" of the Noris Theater in Nürnberg. The site soon became so popular that Bing personally conducted a private tour of the cave for Prince Ludwig of Bavaria.