Fri, 06/28/2024 - 11:48 Tech Insider Travel Professional mountaineer Garrett Madison (left) has summited Mt. Everest (right) 14 times. Even though it's the tallest mountain he's climbed, it's not the most difficult, he says.Garrett Madison, Zzvet/Getty Images Tags Travel, mountaineering, mount-everest, high-altitude-climbing, expedition, adventure Source Mt. Everest is an 'amateur' climb compared to these other peaks, according to a…