Appalachian Trail (hiking), United States
Cutting through 14 states on the Eastern seaboard, the 2,180-mile "A.T." is one of the longest continuously marked trails in the world, taking in a greater variety of scenery than any other path on the continent. The route starts in Georgia's rugged green Chattahoochee-Oconee National Forest, winds up through the vast valleys and peaks of the Great Smoky Mountains and Shenandoah National Park, then crawls through bucolic New England towns before ending in Maine's incredibly isolated Hundred-Mile Wilderness, one of the most likely spots in the country for moose sightings.
Book a Trip: The Appalachian Mountain Club arranges three- and four-day hikes across New Hampshire's White Mountain segment of the trail, a swath of Alpine tundra best experienced when its high-altitude wildflowers are in full bloom (mid-June through September). Trips are led by staff naturalists and include meals, seasonal activities like bird-watching, skiing, or snowshoeing, and accommodation in rustic mountain huts (outdoors.org, three-day hikes from $316).