![El Capitan](https://static.wikia.nocookie.net/memoryalpha/images/a/a0/El_Capitan.jpg/revision/latest/scale-to-width-down/180?cb=20110608171939&path-prefix=en)
El Capitan in Yosemite National Park in 2287
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 free climbing 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 jet boots. (Star Trek V: The Final Frontier)