Try to get there when you can get a tour (at this time - October - 1PM on Sat. and Sun., be sure to check the observatory website). Even if you can't be there for a tour, there are several museum/exhibits that you can visit with much very interesting information about the history and science of the observatory. For anyone even mildly interested in astronomy, this is a must-see if you are in the area. The drive up there does require traversing winding roads, but they are completely modern, paved and well maintained. There is a small fee (free if you have a Golden Eagle Pass), you can get the permit at the observatory. The landscape and views are spectacular.
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