The most amazing feat of engineering is how they kept the entire original building and added all the structures for the expansion down the mountain.
Be sure to watch the construction film at the Leonard Nemoy Event Horizon theater when you visit!
May 1935…….Building opens to public
December 1978..Formation of Friends Of The Observatory
January 2002…Closes for renovation and expansion
October 2002…Groundbreaking for construction
March 2006…..Construction substantially complete
July 2006……Exhibit installation substantially complete
November 2006..Building reopens to the public