Eric Burt has already posted a great description of this area under the "High Sierra" area here. I've also included it under Tuolumne Meadows because of its proximity.
Click the link above.
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Mountain Project's determination of some of the classic, most popular, highest rated routes for Mt. Dana & the Dana Plateau:
Third Pillar (Regular Route) 5.10- Trad, 5 pitches
Featured Route For Mt. Dana & the Dana Plateau
Third Pillar (Regular Route) 5.10- CA : Yosemite National Park : ... : Mt. Dana & the Dana Plateau
***After submitting this description I discovered the much better description by Eric Burt under the High Sierra area. I'll keep this description active because the Third Pillar is commonly considered a Tuolumne climb, but visit Third Pillar, Regular Route for more beta***The Third Pillar is a great little alpine climb on a very unique feature. The entire climb is pretty high quality, but its the exceptional last pitch that makes it a classic. Approach via a well-marked trail at the Tioga Lake Overl...[more] Browse More Classics in CA