1. President Chester Arthur in Yellowstonearthur-yellowstone

2. President Teddy Roosevelt with John Muir at Glacier Point in Yosemite National Park in 1903

Photograph: UCLA Library

Photograph: UCLA Library

3. President Warren G. Harding feeding molasses to Max the Bear

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4. President Franklin D. Roosevelt riding around Yellowstone in a convertible

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5. President Franklin D. Roosevelt during the dedication of the Great Smoky Mountains National Park

Credit: Dept. of Conservation Photograph Collection, Tennessee State Library and Archives

Credit: Dept. of Conservation Photograph Collection, Tennessee State Library and Archives

6. President Dwight D. Eisenhower goes flyfishing

7. President John F. Kennedy dedicating the newly created lake at Whiskeytown National Recreation Area in 1963

Credit: John F. Kennedy Presidential Library

Credit: John F. Kennedy Presidential Library

8. President Lyndon B. Johnson with Lady Bird

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9. President Gerald Ford at Artist Point at Yellowstone National Park in 1976

Photograph: Gerald R. Ford Presidential Library

Photograph: Gerald R. Ford Presidential Library

10. President Jimmy Carter fishing at Lake Clark National Park

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11. President Ronald Reagan with then-Vice President George H.W. Bush

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12. President George H.W. Bush bobsledding with his daughter

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13. President Bill Clinton with daughter Chelsea Clinton and Yellowstone Superintendent Michael Finley

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14. President George W. Bush with former Interior Secretary Gale Norton at Moro Rock in the Sequoia National Park in 2001

White House photo by Eric Draper

White House photo by Eric Draper

15. President Barack Obama in Yellowstone

Photograph: Alex Brandon/AP

Photograph: Alex Brandon/AP

BONUS: President Obama with Bear Grylls