Archenhold Observatory

Celestial Cannon and the Theory of Relativity – This was one of the main attractions at the 1896 Industrial Exposition of Berlin. Visitors raved about the observatory with the longest pointable telescope in the world. It was the only building left standing after the Expo ended; it was rebuilt in 1908. Another fascinating detail: in 1915 Albert Einstein gave his first lecture on the theory of general relativity here.