The Archenhold-Sternwarte in Treptower Park is Germany's largest and oldest public observatory, famous for its 1896 Great Refractor, the world's longest movable lens telescope. Visitors can explore the historic Einstein Hall, a planetarium and a free Museum of Astronomy covering the history of astronomy, the solar system and the scale of the universe, including one of Berlin's largest meteorites.
Chainwit., CC BY 4.0