Who better to take hiking advice from than Andrew Skurka, who has logged over 20,000 of trail miles? No one. National Geographic Adventure recently asked the hiker about his ten favorite hikes.

EASY HIKES: Superior Hiking Trail, Minnesota; Maah Daah Hey Trail, North Dakota; Pacific Crest Trail, Oregon

INTERMEDIATE HIKES: Aravaipa Canyon, Arizona; Appalachian Trail, Virginia and Tennessee; Pacific Northwest Trail, Washington

HARD HIKES: Gulfside Trail, New Hamsphire; Cactus to Clouds Trail, California; Wind River Range, Wyoming; Continental Divide Trail, Colorado