This northern Minnesota park's waterway system, consisting of four large island-studded lakes connected by narrows, was once the route of the French-Canadian voyageurs. A large peninsula with a glaciated, boreal forest landscape completes the ensemble.

Butterflies, wildflowers and a restored piece of tallgrass prairie will be the focus of ranger guided walks at Herbert Hoover National Historic Site on Labor Day. Visitors who'd like to give a little back can help with a volunteer project in the park's 81-acre tallgrass prairie on September 24.

A closer inspection of the Washington Monument in the wake of Tuesday's earthquake has revealed cracks in the uppermost section of the monument, prompting the National Park Service to call in structural engineers with expertise in earthquake engineering to assess the damage.

A focus on some of the science undertaken in the focal point of Crater Lake National Park is being carried across the country, and if you look carefully as you head down the highway you just might see it.