These are the 10 most popular national parks in the US

National parks are as built into the fabric of American society and culture as baseball and road trips down Route 66. The National Parks Service (NPS), the government organization charged with preserving America's natural resources, currently looks after 417 sites that cover more than 84 million acres of protected lands in every US state and territory. And people are flocking to them. The NPS recently reported it received more than 331 million visits in 2016 — breaking all previous records — during its centennial year. Here's a look at the 10 most-visited national parks and why you should plan to visit them, too.

1. Great Smoky Mountains National Park

Number of Visitors: 11,312,786
America's most-visited national park, which saw a staggering 11.3 million visitors in 2016, straddles the border between North Carolina and Tennessee, and is abundant with plant and animal life, scenic hiking trails and Appalachian mountain culture.

2. Grand Canyon National Park

Number of Visitors: 5,969,811
Located in Arizona, the sheer size Grand Canyon National Park is enough to gawk at but its high rims, deep ravines and the winding Colorado River below are bound to leave a lasting impression as well. With views like this, it's no wonder people often get married here.

3. Yosemite National Park

Number of Visitors: 5,028,868
Yosemite, located in California's scenic Sierra Nevada Mountains, is known for its towering ancient sequoias and beautiful Bridalveil Fall vistas. The granite cliffs of El Capitan and Half Dome also bring in rock climbers from all around the world.

4. Rocky Mountain National Park

Number of Visitors: 4,517,585
With more than 300 miles of hiking trails featuring stunning views, 415-square-mile Rocky Mountain National Park is a great place to visit during any season.

5. Zion National Park

Number of Visitors: 4,295,127
Zion National Park is located in southwest Utah and home to steep sandstone cliffs, narrow canyons and forest trails along the Virgin River. Streams flow and collect in Zion's emerald pools, aptly named for their deep green coloration. Zion's also known for having some of the best rock climbing in the US, great news for all the adventure seekers and adrenaline junkies out there.

6. Yellowstone National Park

Number of Visitors: 4,257,177
Established in 1872 by President Ulysses S. Grant, Yellowstone is the world's first national park, consists of more than two million acres of land and is home to thousands of miles of hiking trails, geysers, waterfalls and a plethora of wildlife. A glimpse at the photo below is more than enough reason to start planning your trip.

7. Olympic National Park

Number of Visitors: 3,390,221
This national park is known for its forest, coastal and mountain ecosystems that combine to create this natural wonderland along Washington's Olympic Coast. It's both a UNESCO World Heritage Site as well as an International Biosphere Reserve, making it a living laboratory for scientists and visitors alike.

8. Acadia National Park

Number of Visitors: 3,303,393
Acadia National Park, located right off the Atlantic on Maine's Mount Desert Island, features a number of secluded beaches, long shorelines, inlets, bays, forests, mountains, lakes and ponds. On top of the plethora of natural features and ecosystems you'll find here, Acadia's dark skies are perfect for viewing stunning starry nights, which could be one reason for the more than 3.3 million who visited last year.

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9. Grand Teton National Park

Number of Visitors: 3,270,076
This national park is located just outside Jackson Hole, Wyoming, an area especially popular during the winter when ski fever takes over the region. The Tetons are an outdoor lover's paradise, known for mountaineering, hiking and camping as well as kayaking and canoeing during the summer. Nothing beats escaping the madness of the ski resorts and snowshoeing or cross-country skiing your way through this beautiful national park when the snow has just fallen.

10. Glacier National Park

Number of Visitors: 2,946,681
Called the Crown of the Continent, Glacier National Park was established in 1910 and is made up of a vast range of mountains that were created by prehistoric ice rivers. The park, visited by 2.9 million people last year, is home to forests, waterfalls, glaciers and sparkling lakes.

Remember, there are still eight more days in 2017 where you can enter most US national parks for free — and if you're willing to venture a little farther north, Canada is also letting folks visit its own national parks for free this year when you sign up for a free Discovery Pass.

What's your favorite national park? Tell us about it, below.

H/T: CNN