El Capitan

El Capitan was a geological formation in Yosemite National Park's High Sierras on Earth. Not precisely a mountain, it was actually a giant rock popular with rock climbers.

As a challenge to himself in 2287, James T. Kirk attempted to free climb El Capitan solo, without any safety equipment; an attempt which nearly resulted in his death. Fortunately, Spock saved Kirk's life with the help of his levitation boots. 

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