Mount Washington is the central plug (volcanic neck) of an extinct shield volcano. Details of the mountains origin, eruptive history, geology, and geomorphology can be found at this USGS Mount Washington page
David Mitchell posted the route:
Eric Munsing posted the route (11/12/2015):
The Skier's Sierra High Route is a winter route of approximately 35 miles and 11,000ft gross elevation gain, starting at the Wolverton trailhead in Sequoia National Park, and ending at the Symmes Creek/Shepherd's Pass trailhead near Independence, CA. A rough map of the route can be found here; a more detailed map based on ground-truth GPS data would be appreciated.
Glacier Point is a popular view point above Yosemite Valley. It can be accessed by car, or via the Four Mile Trail, which gains 3200' in 4.8 miles from the floor of Yosemite Valley. This trail roughly follows the route of an old toll trail that was completed in 1872.
"Santiago Peak is the southern mountain of Orange County's Saddleback formation. It is the highest and most prominent peak of both the Santa Ana Mountains and Orange County, and also marks a border point with Riverside County." - Wikipedia
There is a Strava segment for the 7.7 mile ascent. But note that Strava can report times that are off by many seconds, so it is best to report your actual time here.