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- POTSDAM, GERMANY - JUNE 01, 2000: The Einstein Turm astrophysical observatory designed by architect Erich Mendelsohn in 1917 for Albert Einstein Puzzle #871355878
POTSDAM, GERMANY - JUNE 01, 2000: The Einstein Turm astrophysical observatory designed by architect Erich Mendelsohn in 1917 for Albert Einstein Puzzle #871355878