As of right this moment the Mount Wilson Observatory is still standing though flames are very close and people are extremely worried. This webcam shows the Observatory and surrounding areas (though the cam is going down frequently due to overloaded servers) which as you can see are fairly flame covered. As you probably know the MWO is over 100 years old and extremely important in the history of Astronomy including much of the observations and discussion that formulated the Big Bang theory. On Twitter, Xeni Jardin has been posting constant updates on this specific structure and the fires nearby. Keeping my fingers crossed.