The Angeles Crest Highway reached Red Box by late 1934, where the turnoff to Mount Wilson is located. Prior to this, the Mount Wilson Toll Road served as the primary access route.
Around that time, the Mount Wilson Hotel began advertising in local newspapers, offering daily tours of the 100-inch Hooker telescope and free public viewing with the 60-inch telescope on Friday nights. In late 1936, the advertisements expanded to include a 12-inch telescope, available for nightly observing.
The hotel was eventually razed in 1966.