I wonder if Louise Brooks ever visited the Berlin cabaret mentioned in this December 2012 BBC story and video? Check it out at http://www.bbc.co.uk/news/world-europe-20656929 (Thank to Bryan McCarthy for pointing out this news story.)
And for fun, here is a video tour around Berlin in 1929, the same year she was there making Pandora's Box and The Diary of a Lost Girl for G.W. Pabst.