Yellowstone National Park

Zion National Parks red rocks

Here Are All the Fee-Free Days for Every U.S. National Park in 2019

A Yellowstone wolf watches biologists after being tranquilized and fitted with a radio collar during wolf collaring operations in Yellowstone National Park. | Location: Yellowstone Park, Wyoming, United States. (Photo by William Campbell/Sygma via Getty Images)

Beloved Yellowstone Wolf 'Spitfire' Is Killed By a Hunter

Ear Spring geyser / USGS

This Yellowstone Geyser Blasted Out Decades-Old Trash—See What Came Up

The Milky Way shines above the ocean off the coast of Acadia National Park in the early morning hours of Monday, April 23, 2018. Night skies in northern Maine consistently place first in a rating of darkness, meaning there is less light pollution and allowing more stars and planets to be seen. Parks like Acadia, Katahdin Woods & Waters National Monument as well as the Appalachian Mountain Club, which has land holdings in the 100-mile wilderness area, are hoping to boost astrotourism by becoming receiving a dark-sky designation from the International Dark-Sky Association. (Staff photo by Gregory Rec/Portland Press Herald via Getty Images)

See the Mind-blowing Photos From the National Parks #ParkStarWars Instagram Competition

Glacier National Park

National Parks Are Being Affected Twice as Hard by Climate Change

grizzly bear Yellowstone

A Federal Judge Has Saved Yellowstone Grizzly Bears From Hunting