The second-highest Sangre de Cristo peak is Crestone Peak. Among Colorado's most perilous fourteener climbs.
Located in California, Mount Williamson is the second-highest mountain in the Sierra Nevada mountain range.
An active volcano, Mount Rainier has the most glacier ice cover of any mountain in the contiguous United States.
Located in Denali National Park in Alaska, Mount Hunter is the third-highest peak in Alaska.
Mount Fairweather is unique in that it's only 12 miles from the Pacific Ocean. It was named by Captain James Cook, who first saw the peak by ship in 1778.
Mount Sanford is no ordinary mountain but a shield volcano. It's the third-highest volcano in the United States.
The mountain is often referred to as Denali's sister peak. With difficult peaks and terrain, it's a popular challenge for experienced climbers.
Though the highest peak in the US, Denali is controversial. Its height has been contested by a few meters, indicating it may be higher!