This is the west side of the famous "Checkpoint Charlie", one of the only places it was possible to cross from East to West in the formerly divided Berlin. Since at this point you'd be entering East Berlin, the picture over the guard house (which is a replica, the original is now in a museum) is of a Soviet soldier, what you would have seen at the station had you been planning to cross over.

It's worth noting the reason for the name "Checkpoint Charlie". There are many colorful stories as to the origin of this name, but in reality it simply derives from the common military system of ordering things by "A, B, C, D, ..." and since this had been the third checkpoint established, it was letter "C". Common usage deriving from the need to correctly identify letters spoken over the radio meant that this ordering was usually spoken as "Alpha, Bravo, Charlie, Delta, ...", and hence the name "Checkpoint Charlie" for the third checkpoint.

Checkpoint Charlie West