6. Denali (former Mc Kinley), Alaska
Elevation: 6,190m (10,310ft)
Denali is the highest peak of the North American continent. Although you can go climb on your own, it is better to have a guided service while climbing Denali, since it is a unique and not so easy climb, since you need to have some knowledge and experience with winter climbing techniques. And especially because when climbing Denali it should be considered as an expedition and not an overnight climb.