Ancient shoreline features hint that water on Mars once formed a vast ocean.

One of Texas' most visited national park destinations is running on borrowed time as officials scramble to prevent a shutdown in one of its most popular areas. Big Bend National Park is facing a ...

Will Fourt, a senior planner with California State Parks in the Santa Cruz District, stands on a bridge on the Skyline to the Sea Trail that was rehabilitated twice in Big Basin Redwoods State Park in ...