One of the 53 "fourteeners" in Colorado—mountains that exceed 14,000 feet—Longs Peak still manages to reach higher into the heavens than any other mountain in Rocky Mountain National Park at 14,259 feet. Thousands of climbers set off every year to attempt the summit. Some climbers will try to reach the peak of every fourteener in the US during their lifetimes—that"s 96 different mountains.