It's a big year for national parks. Last year, America's most beloved public lands welcomed a record 307 million visitors.
Why are those numbers likely to rise this year? The National Park Service has been banging a drum about its centennial year. The agency was created Aug. 25, 1916.
Parks have been busy scheduling lots of events and urging people to come and explore.
And overnight stays in the parks, including hotels, cabins, camping and other lodgings, increased 6% over 2014.
Here are the 10 most popular national parks according to number of visitors. Most of them are in the West, so expect to see more people out and about if you're planning a visit anytime soon.
1. Great Smoky Mountains National Park in North Carolina and Tennessee
2. Grand Canyon National Park in Arizona
3. Rocky Mountain National Park in Colorado
4. Yosemite National Park in California
5. Yellowstone National Park in Idaho, Montana and Wyoming
6. Zion National Park in Utah
8. Grand Teton National Park in Wyoming
9. Acadia National Park in Maine
10. Glacier National Park in Montana
The National Park System includes 409 areas and units, which include national parks.
Here are the 10 most popular areas in the country:
1. Blue Ridge Parkway from North Carolina to Virginia
2. Golden Gate National Recreation Area in the Bay Area
3. Great Smoky Mountains National Park in North Carolina and Tennessee
4. Lincoln Memorial in Washington, D.C.
5. Lake Mead National Recreation Area in Arizona and Nevada
6. George Washington Memorial Parkway in the Washington, D.C., area
7. Gateway National Recreation Area in New York and New Jersey
8. Natchez Trace Parkway in Alabama, Mississippi and Tennessee
9. Vietnam Veterans Memorial in Washington, D.C.
10. Grand Canyon National Park in Arizona