Hamburg Observatory
The Hamburg Observatory occupied the museum's current site from 1825 to 1912 before being moved to Bergedorf. The area was part of the old city wall defences built by the Dutchman Jan van Valckenborgh. These walls were part of "Bastion Henricus", which was a baroque fortification built between 1616 and 1625. The museum was formerly located at the "Johanneum" school.