The battle to prevent quagga mussels from establishing a reproducing population in Lake Powell continued earlier this month with an intensive four-day search and destroy dive operation at the two major marinas on the lower end of the lake. Based on the results, officials at Glen Canyon National Recreation Area are optimistic the huge lake can still be kept free of an infestation.

Repeated rockfalls, including one that featured pickup-truck-sized boulders that fell as much as 400 feet, have forced Dinosaur National Monument officials to close a stretch of the popular Jones Hole Trail.

After a relocation and rigorous restoration, the historic Haynes Photo Shop reopens to the public in Yellowstone National Park this weekend, with the grand opening running through next week, too.

Come June 27, it will have been 237 years since the Presidio of San Francisco was founded. Not surprisingly, that's cause for celebration!