A jogger makes his way up the Mt. Wilson Toll Road in Altadena, the same trail upon which the first telescopes were hauled to the Mt. Wilson Observatory a century ago. (Genaro Molina / Los Angeles Times)
The trail is also popular with horsemen and horsewomen. (Genaro Molina / Los Angeles Times)
Hikers Frank Dooley, left, and Russell Silver climb the Mt. Wilson Toll Road. (Genaro Molina / Los Angeles Times)
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A jogger is silhouetted during a run at sunset along the Mt. Wilson Toll Road. (Genaro Molina / Los Angeles Times)