On the Day of Open Monuments, 14 September 2025, the AIP will open the Einstein Tower on the Telegrafenberg in Potsdam from 10 a.m. to 4 p.m. Members of the Großer Refraktor e.V. association will also open the Great Refractor, the fourth-largest refracting telescope in the world, and offer guided tours of the Telegrafenberg as well as explanations about the telescope.

• Date:
  Sept. 14, 2025, 10 a.m. – 4 p.m.
  
  
• Location:

  Einstein Tower and Great Refractor, Telegrafenberg, 14473 Potsdam

  
  
• Contact:
  presse@aip.de
  
  
• More information:
  https://www.tag-des-offenen-denkmals.de