So popular were the free cave tours at Mammoth Cave National Park last year that park officials have decided to offer similar days this year, beginning with Valentines Day.

Don Neubacher, a 28-year veteran of the National Park Service who has spent the past 15 as superintendent of Point Reyes National Seashore, is moving over to take the helm at Yosemite National Park.

High flows of the Colorado River through Grand Canyon National Park that mimic natural ebbs and flows are beneficial for the river corridor, according to a U.S. Geological Survey report. However, the report notes that many of the benefits are erased within six months due to energy demands that dictate releases through the Glen Canyon Dam.