In 1956 there was a mid air collision of two commercial planes over the GC, in 2014 they erected a memorial plaque in remembrance. If you have been to the GC, the site is located near the desert Tower.
I've been there too but didn't see the plaque. You got some beautiful photos. Several books have been written about the tragic Donner group. One that I liked was "The Indifferent Stars Above" by Daniel James Brown (2009).
It is rich with history that is for sure, thanks so much for looking glad you enjoyed the photo's.