Take a hike in Acadia National Park and you'll be walking through various chapters of history, a fact recognized officially with addition of the park's trail system to the National Register of Historic Places.

A population boom has lifted the tally of rare Devils Hole pupfish at Death Valley National Park to a 22-year high of 175, according to the annual spring count.

It's time to take oil drilling in Big Cypress off the table.

After discovery of invasive zebra mussel veligers (larvae) in Black Bay of Voyageurs National Park's Rainy Lake late last year, park staff is starting a containment and prevention program that involves educational activities as well as new management operations related to Kettle Falls and Gold Portage areas.