Frogs living high in Sierra Nevada national parks such as Lassen Volcanic and Sequoia are slowly being "contaminated" by agricultural pesticides, according to a study that found the contamination even in "the most remote mountain locations."

Some of the fascinating history of the region surrounding Cumberland Gap National Historical Park will unfold Saturday during the 3rd Annual Within the Shadows of Cumberland Gap Heritage Walk.

Katmai National Park and Preseve in Alaska tops the marquee when brown bears are mentioned, but there's another national park in Alaska that will surprise you with its bear-viewing opportunities.

Olympic National Park officials have approved a "recreational" bike ride that could attract 700 cyclists and temporarily close the Hurricane Ridge Road for seven hours on August 4.