with aluminum paint. A decorative metal rail surrounds the exterior of the office segment roof. The 1963 planetarium addition is on the rear of the building. It features a perforated aluminum dome and a Spitz A-3-P Star Projector. Up to 65 people can be seated in the addition. See also List of astronomical observatories References External links Astronomical observatories in Illinois Elgin, Illinois Industrial buildings and structures on the National Register of Historic Places in Illinois National Register of Historic Places in Kane County, Illinois Education in Kane County, Illinois