Hello, we had incredibly clear sunny weather here on Saturday, so I decided to go to Potsdam to take some pictures of the Einstein tower which I still had on my list..). That tower is located here on a small hill within a science park of small, mostly geological or astronomical institues. Before I came to the Einstein tower, I came across this old telescope house which is obviously not used anymore: It is located right next to the Michelson house (1879) which was the first observatory building on this hill: Today it is used for climate research (some big computers in the basement), and one dome is still used for sun observations. In the south of that building you come to the big refractor (lens telescope) (1899), the fourth biggest one on earth, which is currently under reconstruction. It was used until 1968 and consists of two 12.5m long telescopes with 0.5m and 0.8m big front lenses. In the south of that you eventually come to the real destination of the trip, the Einstein tower: It was built 1924 to house a sun observatory, to prove Einstein's theory of relativity, which wasn't successful due to turbulences on the sun's surface. Instead, Europe's first sun telescope helped to explore those turbulences and their relationship to the earth's magnetifield, besides other phenomenons. This is a model of the building: (That guy with the orange shirt is me :smile Did I mention it was marvelous weather? Oh, and here's the promised brain I found... Don't ask.. D200 + 17-55 + CPL/Tamron 90. Thanks for looking. Whole gallery is here.