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  1. Kathleen Lake in Yukon Territory, Canada, in the Kluane National Park and Reserve
  2. Bison herd in the Lamar Valley of Yellowstone National Park in Wyoming
  3. Skyline Drive, Shenandoah National Park, Virginia
  4. Lassen Volcanic National Park - WPA Poster
  5. Utah, Bryce Canyon National Park, Thor's Hammer near Sunset Point
  6. Wyoming, Bighorn sheep in Yellowstone National Park
  7. Montana, Glacier National Park, Logan Pass, Bighorn Sheep Rams
  8. Colorado, Colorado National Monument, Monument Canyon, Independence Monument
  9. Sand dunes in a desert, Great Sand Dunes National Park, Colorado
  10. Milford Sound, Fiordland National Park, South Island, New Zealand
  11. Silhouette of soldiers from the U.S. Army National Guard
  12. Sandstone Formations in the Fiery Furnace, Arches National Park, Utah
  13. Lenticular clouds over mountain range, Grand Teton National Park, Wyoming
  14. Slickrock waterpocket pools, Canyon De Chelly National Monument, Arizona
  15. Thor's Hammer overlooking Navajo Loop in Bryce Canyon National Park, Utah
  16. Minnesota, Superior National Forest
  17. Triple Falls, Glacier National Park, Montana
  18. Monument to Maj. Gen. George G. Meade, Gettysburg National Military Park
  19. Fog drifts through a conifer and aspen forest, Grand Teton National Park
  20. Close-up of Mountain Dogwood flowers, Merced River, Yosemite National Park
  21. Kilauea lava flowing into the Pacific Ocean, Hawaii Volcanoes National Park, Hawaii
  22. The Mesa Arch with bright sunlight in Canyonlands National Park, Utah
  23. View along the Hooker River to Mount Sefton, Aoraki National Park, New Zealand
  24. Beautiful snowcapped mountain near the Shiretoko National Park, Hokkaido, Japan
  25. Portrait of an African lion, Serengeti National Park, Tanzania
  26. Gifford Homestead at Capitol Reef National Park
  27. Sand dunes, Sossusvlei, Namib Desert, Namib-Naukluft National Park, Namibia
  28. Low angle view of mountains, Zion National Park, Utah
  29. Africa, Rwanda, Musanze District, Volcanoes National Park
  30. Bridalveil Falls In Mist, Yosemite National Park, California, USA
  31. Star Trails Over Mesa Arch In Canyonlands National Park
  32. Snow capped mountains in the Daisetsuzan National Park, Hokkaido, Japan
  33. White-headed buffalo weaver, Serengeti National Park, Tanzania
  34. American pika, San Juan National Forest, Colorado
  35. Zion National Park Late Autumn Landscape View With Watchman Peak, Utah
  36. Zion National Park, View Through The Red Cliffs Of Kolob Canyon
  37. Hippopotamus mother and baby, Ruaha National Park, Tanzania
  38. Golden Cathedral Porthole Arch In Neon Canyon, Escalante National Monument, Utah
  39. The Sun Rises Over Badlands National Park, South Dakota
  40. Argentina, Santa Cruz: Los Glaciares National Park
  41. Autumn colors in the Sneffels Mountain Range, San Juan National Forest, Colorado
  42. Wildflowers in a field, East Glacier Park, US Glacier National Park, Montana
  43. Ribno Banderishko Lake in Pirin National Park, Bansko, Bulgaria
  44. Rocks on the coast, Acadia National Park, Maine, New England
  45. Utah, Bryce Canyon National Park, Thor's Hammer near Sunset Point
  46. Shelf cloud with thunderstorm over Grasslands National Park, Saskatchewan
  47. An America Bison Forages During A Snow Storm In Yellowstone National Park, Wyoming
  48. Mcdonald Lake Glacier National Park