8. Mount Longs Peak
Location: Colorado
Altitude: 14,255 feet
Elevation gain: 5,100 feet
Time required: about 6 hours
If you take the Keyhole route, you’ll have some serious climbing to do. While some people take pets with them on their climbing trips, on this route, they’re strictly forbidden. It’s a tedious, long climb, and the last mile requires plenty of scrambling. A piece of advice: start as early as possible in summer. You don’t want to experience any thunderstorms in the middle of your ascent.
