Ethnological Museum of Berlin
Ethnology has never appealed much to me. However, entering the Dahlem Museum, I discovered that one can see the story of five continents, without leaving Berlin. Incredible but true. I have spent hours there, the collections they have are admirable. And, best of all, the museum is super quiet, ie no queues, annoying people trying to take pictures of the works, noise, etc. Also, the price is quite reasonable, for 6 euros you can see the entire museum, 3 euros if you get discounted entrance. So if you like ethnology, I'd recommend it.