The Appalachian Trail extends 2,180 miles all the way from Maine to Georgia. The continuously marked trail offers hundreds of access points, making it convenient (and free) for day hikers.
Hikers seeking a challenging day trek need look no further than Yosemite National Park's Half Dome. The 7-mile round trip includes a 400-foot cable ascent up the granite face to the summit.
As one of Zion National Park's most popular trails, Angel’s Landing has everything a day hiker could hope for: steep ascents, 21 exposed switchbacks and 360-degree views over the surrounding canyon.
Hikers who make the 2.2-mile trek to the top of Parkman Mountain in Maine's Acadia National Park will be rewarded with panoramic views over the Somes Sound and Sargent Mountain.
The 11-mile round trip hike in Montana's Glacier National Park takes you past the brilliant blue waters of Lake Josephine and Grinnell Lake, through fields of wildflowers and up onto Grinnell Glacier itself.
Colorado is a hiker's paradise, and this hike past some of Rocky Mountain National Park's most picturesque lakes takes you 3.6 miles round-trip from the Bear Lake Trailhead.
On this trail in the Columbia River Gorge in Oregon, visitors pass a half-dozen waterfalls along a path that was blasted through the cliffs by resourceful Italian engineers more than a century ago.
Hikers that make the 2.4-mile hike to Calloway Peak in Grandfather Mountain in North Carolina are rewarded with a view described by naturalist John Muir as "the face of all Heaven come to earth."
If you can tear yourself away from the water long enough to brave the treacherous 11-mile Kalalau Trail on Kauai, you'll find yourself in the midst of the verdant cliffs of Kalalau Valley.
They say that everything's bigger in Texas, and Big Bend National Park's South Rim Loop is indeed a big one as far as hiking trails go. The 12.6-mile loop includes a 2,000-foot elevation change.