It will be free to enter any U.S. National Park one day next week. To help spread the word about the free-entry day, NPS posted a funny video.

The man responsible for a double homicide in Devil’s Den State Park has been arrested for the crime. Disturbingly, he was a school teacher.

An 11-year-old girl died while boating in Wisconsin. Her cause of death is more complicated than originally thought, prompting a warning.

Andreas Tonelli fell 200 meters while biking in the Italian Dolomites on July 15. Get a glimpse into his final moments.

Yellowstone National Park announced an incident in which a teen became severely burned at a thermal area. Learn more.

A woman was enjoying a popular trail in Yosemite National Park when a large tree branch fell and crushed the hiker.

Three years after a shark attacked a young boy while snorkeling, his family has released footage from the moments leading up to the attack.

A hiker is recovering from her injuries after a bear mauled her on a trail outside of Anchorage, Alaska. Get the story here.

On Sunday, a mountain lion attacked a 4-year-old child at Olympic National Park in Washington. Get the story here.

Chimps living together at a sanctuary in Zambia began copying each other by wearing blades of grass in their ears . . . and in their butts.