The first observatory of Heidelberg was officially opened on Mount Königstuhl in 1898 with the assistance of Duke Friedrich I of Baden. The construction of the modern observatory building was completed in 2011. If you look at it from above, you will see that it is built in the shape of a spiral galaxy. The exhibition halls and classrooms for seminars are in the "arms" of the spiral. The galaxy’s center has a lecture hall with 100 seats. The planetarium has a digital system from Zeiss, allowing carrying out astronomical observations. Telescopes are also used for public displays in the old building, which is now owned by the University of Heidelberg.