Located in the San Gabriel Mountains near the foothill communities of Altadena and Pasadena, the Mt. Wilson resort was an easy day trip by automobile from Los Angeles. It was also home to the Mt. Wilson observatory, with its 100-inch Hooker telescope, the largest in the world.
Roads from Altadena, 9 miles away, had been built to transport the telescopes the mountain starting after 1905; afterward they accommodated automobiles. Pasadena was about 12 miles away via the Mt. Wilson Toll Road. The hotel’s auto-stage (bus) made the trip daily
The Hooker 100-inch telescope was installed in 1917. New scientific theories and discoveries were being tested or proven all the time in the 1920s using data from the Hooker telescope. It remained the largest in the world until 1948. If hotel visitors wrote in advance to request it, they could look through the telescope on Friday nights.