Adventurer Mikah Meyer has visited many U.S. national parks and been struck by the extent to which Native American history is part of so many.
The U.S. National Park Service is marking its 100th anniversary by hosting more than 100 ceremonies to swear in new U.S. citizens.
With its largest expansion in nearly 70 years, Yosemite National Park gains wetlands, meadows and rolling hills that are a haven for endangered species.
Marine sanctuaries protect nature while allowing people to use the waters sustainably. On World Ocean Day, read about U.S. marine sanctuaries.
President Obama has expanded a national monument off the coast of Hawaii, creating a safe zone for tuna, sea turtles and thousands of other species.
President Obama is the first sitting U.S. president to project himself into virtual reality with a 360-degree representation of Yosemite National Park.
The National Park Service celebrated its 100th birthday with a living emblem made by people holding umbrellas in its colors on Washington's National Mall.
In celebration of its centennial, the National Park Service received 35,000 hectares of land in Maine from a private donor.
Take a trip down memory lane ... and across the U.S.! These vintage national parks posters show America's evergreen beauty.