Ascending the peaks in Zion National Park – carefully. (Photo via Instagram: brianstowell)

Ascending the peaks in Zion National Park – carefully. (Photo via Instagram: brianstowell)

Looking back on Acadia National Park's famous Sand Beach from the summit of the Beehive. (Photo via Instagram: rondack13)

Looking back on Acadia National Park's famous Sand Beach from the summit of the Beehive. (Photo via Instagram: rondack13)

Happy 100th birthday to the National Park Service! Here's to another century of stewardship in the country's most beautiful natural places. Acadia National Park, Maine.

Happy 100th birthday to the National Park Service! Here's to another century of stewardship in the country's most beautiful natural places. Acadia National Park, Maine.

Perched at one of our favorite hidden gems at Acadia National Park: The Raven's Nest, an unmarked spot off Schoodic Peninsula's loop road. (Photo via Instagram: munjoyboy)

Perched at one of our favorite hidden gems at Acadia National Park: The Raven's Nest, an unmarked spot off Schoodic Peninsula's loop road. (Photo via Instagram: munjoyboy)

You can now buy annual and 7-day entrance passes for Acadia National Park at the L.L.Bean Freeport Store! Get your pass, get your gear, and get ready for adventure during the Acadia National Park Centennial 2016. #nps100 #Acadia100 http://www.nps.gov/acad/index.htm

You can now buy annual and 7-day entrance passes for Acadia National Park at the L.L.Bean Freeport Store! Get your pass, get your gear, and get ready for adventure during the Acadia National Park Centennial 2016. #nps100 #Acadia100 http://www.nps.gov/acad/index.htm

April 16-24 is #NationalParkWeek – celebrating America's best idea with free admission to every National Park. In recognition of this great event (created by the National Park Service and our conservation partners the National Park Foundation) we're highlighting a different National Park every day through April 24.  We end the week with the country's newest National Park: Pinnacles National Park in California. Established on January 10, 2013.

April 16-24 is #NationalParkWeek – celebrating America's best idea with free admission to every National Park. In recognition of this great event (created by the National Park Service and our conservation partners the National Park Foundation) we're highlighting a different National Park every day through April 24. We end the week with the country's newest National Park: Pinnacles National Park in California. Established on January 10, 2013.

April 16-24 is #NationalParkWeek – celebrating America's best idea with free admission to every National Park. In recognition of this great event (created by the National Park Service and our conservation partners the National Park Foundation) we're highlighting a different National Park every day through April 24.  Our next featured park is Zion National Park, the first National Park established in Utah.

April 16-24 is #NationalParkWeek – celebrating America's best idea with free admission to every National Park. In recognition of this great event (created by the National Park Service and our conservation partners the National Park Foundation) we're highlighting a different National Park every day through April 24. Our next featured park is Zion National Park, the first National Park established in Utah.

April 16-24 is #NationalParkWeek – celebrating America's best idea with free admission to every National Park. In recognition of this great event (created by the National Park Service and our conservation partner the National Park Foundation) we're highlighting a different National Park every day through April 24.  Today we turn to the only American National Park south of the equator: the National Park of American Samoa. Spread across three South Pacific Islands – Tutuila, Ofu and Ta‘ū.

April 16-24 is #NationalParkWeek – celebrating America's best idea with free admission to every National Park. In recognition of this great event (created by the National Park Service and our conservation partner the National Park Foundation) we're highlighting a different National Park every day through April 24. Today we turn to the only American National Park south of the equator: the National Park of American Samoa. Spread across three South Pacific Islands – Tutuila, Ofu and Ta‘ū.

April 16-24 is #NationalParkWeek – celebrating America's best idea with free admission to every National Park. In recognition of this great event (created by the National Park Service and our conservation partners the National Park Foundation) we're highlighting a different National Park every day through April 24.  Today we head north to Gates of the Arctic National Park in Alaska.

April 16-24 is #NationalParkWeek – celebrating America's best idea with free admission to every National Park. In recognition of this great event (created by the National Park Service and our conservation partners the National Park Foundation) we're highlighting a different National Park every day through April 24. Today we head north to Gates of the Arctic National Park in Alaska.

"The mountains are calling, and I must go." Happy birthday to the quotable naturalist John Muir, founder of the Sierra Club.  (John Muir Trail, Yosemite National Park)

"The mountains are calling, and I must go." Happy birthday to the quotable naturalist John Muir, founder of the Sierra Club. (John Muir Trail, Yosemite National Park)

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