Köln Rautenstrauch Joest Museum, Germany

First and foremost, if you are ever in Cologne, it is imperative that you buy a museum pass, because not only will it save you money when you go to the highlights.  We bought is for 15 euros each (and if we had two children they would also have been able to come in to) and we got it at the Ludwig Museum, which would have been 12 euros each to get into.  There are two other high profile museums on the pass, but you also might end up at a place like this, because in essence it is a free admission.
The 3,400 objects from the anthropological estate of the geographer and ethnologist Dr. Wilhelm Joest (1852-1897) formed the foundation of the collections of the RJM. His sister Adele was married to Eugen Rautenstrauch. In 1899 the couple donated the estate of Wilhelm Joest to the City of Cologne.  This is really not only a look at how to appreciate different cultures and a lens with which to do so, but also a glimpse into the vast travel experience that an independently wealthy gentleman in the 19th century could amass.