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The United States is home to some of the most incredible natural sights and wonders in the world — from towering mountains to otherworldly rock formations — and we're grateful the National Park Service honors and preserves many of these unique sights.
The agency proudly fosters outdoor exploration for over 300 million guests each year, but if you haven't been fortunate enough to visit the powerful geysers of Yellowstone or the labyrinthine tunnels of Mammoth Caves in person, then fear not.
We've rounded up some of the most awe-inspiring and unique features of national parks across the country for your appreciation.
Colorado's Great Sand Dunes National Park is like a giant sandbox for adults, featuring the highest sand dunes in North America at the tallest dune towers 750 feet high, as well as stunning views of the Sangre de Cristo Mountains.
Glacier National Park is a winter warrior's paradise, with snow that lasts well into early summer. The popular, 50-mile Going-to-the-Sun Road boasts harrowing mountainside driving and unmatched views of the park's glaciers and carved valleys.
Zion National Park in southwestern Utah is known for its breathtaking red sandstone canyons. The Narrows in Zion Canyon is a popular hike, featuring walls that are 1,000 feet tall and a river less than 30 feet wide.
An easily accessible park from much of the East Coast, Shenandoah National Park is a wonderland of vistas and calming waterfalls in Northern Virginia. The park is in the Blue Ridge Mountains, and a portion of the Appalachian Trail runs through it.
At Kenai Fjords National Park in Alaska, visitors can get up close and personal to marine mammals. If they're lucky, they'll also catch a glimpse of one of the park's 40 glaciers "calving," meaning that massive chunks of ice will break off the main glacier and crash into the bay below.
Death Valley National Park in California is the "hottest, driest, and lowest national park" in the US according to National Parks Services, and it features stunning, otherwordly rock formations.
Saguaro National Park, home to the almost comically large cacti of the same name, is a bastion of the American Southwest. In the Sonoran Desert surrounding Tucson, Arizona, it's home to desert wildlife as well as historic petroglyphs.
Less than a day's drive from Los Angeles, California's Yosemite National Park, which caught the attention of early American explorers like John Muir, is a wealth of granite cliffs, stunning waterfalls, and panoramas perfect for sunset viewing.
Yosemite National Park.
f11photo/Shutterstock
Guests can check out solid volcanic rock fields, still-active steam vents, and even active lava flow from the Kīlauea volcano in the Hawaii Volcanoes National Park, on Hawaii's Big Island.
Hawaii Volcanoes National Park.
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Arches National Park, in southern Utah, is likely the most iconic of the state's five national parks. The classic red rock formations appear hand-sculpted, with over 2,000 natural arches, as well as rock pinnacles and canyons to admire.
Arches National Park.
Andrew S./Shutterstock
Alaska is home to the five largest parks in the country, as well as the tallest peak in North America, which lies in Denali National Park. Visitors to this protected wilderness may glimpse bears, moose, and other wildlife while enjoying nearly 24-hour daylight in the summer.
The Great Smoky Mountains National Park had over 10 million visitors in 2015, making it the country's most-visited park. Lush hills, valleys, and a plethora of plant and animal life span the border of North Carolina and Tennessee.
Great Smoky Mountains National Park.
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Acadia National Park, on the rocky Atlantic coast of Maine, was the first national park created east of the Mississippi River. It features scenic drives, strenuous hiking, and beachside frolicking.
Acadia National Park.
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An ocean paradise made up of seven islands, Dry Tortugas National Park in the Florida Keys is home to coral and marine life, temperate Caribbean waters, and the historic walls of Fort Jefferson, a 19th century stronghold that protected America's ships.
Colorado's Mesa Verde National Park celebrates the history of America's first people with thousands of archaeologic sites and over 600 cliff dwellings built into cliffs by the Pueblo.
Joshua Tree National Park spans the meeting point of the Mojave and Colorado deserts in Southern California. Its prickly namesake trees and desert rock formations draw hikers and explorers to its wide open skies.
Joshua Tree National Park.
Dejan Stanisavljevic/Shutterstock
America's first national park and arguably one of the most recognizable, Yellowstone, which spans Montana, Wyoming, and Idaho, boasts ancient volcanic activity deep underground that translates into numerous geysers, hot springs, and other geologic phenomena.
Yellowstone.
Lorcel/Shutterstock
Michigan's Isle Royale National Park, in the middle of Lake Superior, offers visitors the chance to scuba dive in the largest freshwater lake in the world, as well as hike, kayak, canoe, or just relax shoreside.
Guests still shaking off the chill of winter will love the historic bathhouses and pools at Hot Springs National Park in Arkansas. The water spilling out at the base of Hot Springs Mountain can reach a toasty 143 degrees Fahrenheit.
It may be crowded, but for good reason: the Grand Canyon's massive dimensions seem to go on forever — even more so for those visitors braving the challenging hike down to the bottom of the canyon.